What is the Function of NOx Sensors on Diesel/Lean-Burn Engines?
NOx sensors on diesel and lean-burn engines primarily monitor the levels of nitrogen oxides (NOx) in the exhaust gas to ensure compliance with emissions regulations and optimize engine performance. At CARDIAGTECH.BIZ, we understand the critical role these sensors play in modern vehicles and offer a comprehensive range of diagnostic tools and replacement parts to keep your engine running smoothly and efficiently. Let’s dive into the world of NOx sensors and explore their functions, importance, and troubleshooting.
1. What is a NOx Sensor?
A NOx sensor is a vital component in the exhaust system of diesel and lean-burn gasoline engines. Its primary function is to measure the concentration of nitrogen oxides (NOx) in the exhaust gases. NOx are harmful pollutants formed during the combustion process, especially under high temperature and pressure conditions. These sensors help ensure that the engine’s emissions control systems are working effectively to reduce NOx emissions, complying with environmental regulations such as Euro 6 and EPA standards.
1.1. Key Components of a NOx Sensor
A typical NOx sensor consists of several key components:
- Sensing Element: This is the core of the sensor, usually made of ceramic materials like zirconia or titania. It reacts with NOx molecules in the exhaust gas, generating an electrical signal proportional to the NOx concentration.
- Heater: To function accurately, the sensing element needs to operate at a high temperature, typically between 600°C and 800°C. The heater ensures that the sensor reaches and maintains this optimal temperature quickly.
- Electronic Control Unit (ECU): The ECU processes the signal from the sensing element and communicates with the engine control unit (also called ECU). It also performs diagnostic functions, such as monitoring the sensor’s performance and detecting faults.
- Protective Housing: This protects the sensor from the harsh environment of the exhaust system, including high temperatures, vibrations, and corrosive gases.
1.2. Working Principle
The NOx sensor operates based on electrochemical principles. Here’s a step-by-step breakdown of how it works:
- Exhaust Gas Exposure: The sensor is positioned in the exhaust stream, where it is exposed to the exhaust gases.
- NOx Reaction: The NOx molecules in the exhaust gas react with the sensing element.
- Ion Transportation: This reaction causes oxygen ions to move through the ceramic material.
- Signal Generation: The movement of oxygen ions generates an electrical signal. The strength of this signal is directly proportional to the concentration of NOx in the exhaust gas.
- Data Transmission: The ECU interprets this signal and sends the data to the engine control unit (ECU).
- Feedback Loop: The engine ECU uses this information to adjust the air-fuel mixture and other engine parameters to optimize combustion and reduce NOx emissions.
2. Why are NOx Sensors Important?
NOx sensors are crucial for several reasons, primarily related to environmental protection, regulatory compliance, and engine performance.
2.1. Environmental Protection
Nitrogen oxides (NOx) are significant air pollutants that contribute to several environmental problems:
- Smog Formation: NOx reacts with volatile organic compounds (VOCs) in the presence of sunlight to form smog, which can cause respiratory problems and reduce visibility.
- Acid Rain: NOx can react with water vapor in the atmosphere to form nitric acid, a major component of acid rain, which damages ecosystems and infrastructure.
- Ozone Depletion: While NOx can contribute to ozone formation at ground level (which is harmful), it can also contribute to the depletion of the ozone layer in the upper atmosphere, which protects us from harmful UV radiation.
2.2. Regulatory Compliance
Governments worldwide have established strict emissions standards to limit the amount of NOx and other pollutants that vehicles can release into the atmosphere. NOx sensors help ensure that vehicles meet these standards. For example:
- Euro Standards: In Europe, the Euro standards define the maximum allowable emissions for vehicles. The latest standard, Euro 6, requires significant reductions in NOx emissions from diesel vehicles.
- EPA Standards: In the United States, the Environmental Protection Agency (EPA) sets emissions standards for all vehicles sold in the country. These standards are designed to protect air quality and public health.
2.3. Engine Performance Optimization
NOx sensors not only help in reducing emissions but also play a role in optimizing engine performance. By providing real-time data on NOx levels, the engine control unit (ECU) can make adjustments to:
- Air-Fuel Ratio: Optimizing the air-fuel ratio ensures efficient combustion, reducing the formation of NOx.
- Exhaust Gas Recirculation (EGR): Adjusting the EGR rate helps lower combustion temperatures, thereby reducing NOx formation.
- Selective Catalytic Reduction (SCR): Monitoring the effectiveness of the SCR system ensures that it is properly reducing NOx emissions.
3. Common Symptoms of a Failing NOx Sensor
When a NOx sensor fails, it can lead to a variety of problems affecting your vehicle’s performance and emissions. Recognizing these symptoms early can help you address the issue before it causes more significant damage. Here are some common signs of a failing NOx sensor:
3.1. Check Engine Light
One of the most common indicators of a problem with the NOx sensor is the illumination of the check engine light on the dashboard. When the sensor detects abnormal NOx levels or malfunctions, it sends a signal to the engine control unit (ECU), which then triggers the check engine light.
- Diagnostic Trouble Codes (DTCs): The ECU stores specific diagnostic trouble codes (DTCs) that can be retrieved using an OBD-II scanner. Common codes associated with NOx sensor issues include P2200, P2201, P2202, P2203, and others, indicating circuit malfunctions, range/performance issues, or high/low signals. At CARDIAGTECH.BIZ, you can find a range of OBD-II scanners to help you diagnose these issues quickly and accurately.
3.2. Reduced Engine Performance
A faulty NOx sensor can cause a noticeable decline in engine performance. The engine control unit (ECU) relies on the sensor’s data to optimize the air-fuel mixture and other parameters. When the sensor provides inaccurate or no data, the ECU may not be able to properly adjust these settings, leading to:
- Decreased Power: The engine may feel sluggish or underpowered, especially during acceleration.
- Poor Fuel Economy: Inefficient combustion can result in increased fuel consumption.
- Rough Idling: The engine may idle roughly or stall, particularly when starting or at low speeds.
3.3. Increased Emissions
The primary function of the NOx sensor is to help control emissions. When it fails, the vehicle may produce excessive levels of harmful pollutants, including nitrogen oxides (NOx). This can lead to:
- Failed Emissions Test: The vehicle may fail an emissions test, which is required in many jurisdictions for registration and legal operation.
- Visible Smoke: In some cases, a failing NOx sensor can cause the engine to produce visible smoke from the exhaust pipe.
- Strong Odor: You may notice a strong, unusual odor coming from the exhaust, indicating incomplete combustion and high levels of pollutants.
3.4. Difficulty Starting
In some instances, a faulty NOx sensor can make it difficult to start the engine. This is because the engine control unit (ECU) uses the sensor’s data to manage the combustion process. If the sensor is not providing accurate information, the ECU may struggle to ignite the air-fuel mixture properly.
3.5. Engine Stalling
A failing NOx sensor can also cause the engine to stall, especially at low speeds or when idling. This is often due to the engine control unit (ECU) misinterpreting the sensor data, leading to an incorrect air-fuel mixture.
4. Causes of NOx Sensor Failure
Several factors can contribute to the failure of a NOx sensor. Understanding these causes can help you prevent future issues and maintain your vehicle’s emissions control system.
4.1. Contamination
One of the most common causes of NOx sensor failure is contamination from various sources:
- Soot and Carbon Deposits: Over time, soot and carbon deposits from the combustion process can accumulate on the sensing element, reducing its ability to accurately measure NOx levels.
- Oil and Coolant Leaks: Leaks from nearby engine components, such as oil or coolant, can contaminate the sensor and damage its internal components.
- Fuel Additives: Certain fuel additives can leave deposits on the sensor, affecting its performance.
4.2. Physical Damage
The NOx sensor is located in the harsh environment of the exhaust system, making it susceptible to physical damage:
- Vibration: Constant vibration from the engine can cause the sensor to loosen or break.
- Thermal Stress: High temperatures and rapid temperature changes can cause thermal stress, leading to cracks and failures in the sensor’s ceramic components.
- Impact Damage: Road debris or accidents can physically damage the sensor, rendering it inoperable.
4.3. Electrical Issues
Electrical problems can also lead to NOx sensor failure:
- Wiring Problems: Damaged, corroded, or loose wiring can disrupt the sensor’s connection to the engine control unit (ECU).
- Short Circuits: Short circuits in the sensor or its wiring can cause it to malfunction or fail completely.
- Voltage Issues: Overvoltage or undervoltage can damage the sensor’s internal electronics.
4.4. Aging
Like all electronic components, NOx sensors have a limited lifespan. Over time, the sensing element can degrade, reducing its accuracy and eventually leading to failure. The lifespan of a NOx sensor typically ranges from 80,000 to 120,000 miles, depending on the vehicle and operating conditions.
4.5. Poor Fuel Quality
Using low-quality fuel can contribute to NOx sensor failure. Poor fuel quality can lead to incomplete combustion, resulting in higher levels of soot and other contaminants that can damage the sensor.
5. How to Test a NOx Sensor
Testing a NOx sensor requires specialized equipment and knowledge. Here’s a general overview of the testing process:
5.1. Visual Inspection
Begin by visually inspecting the sensor and its wiring for any signs of damage, such as cracks, corrosion, or loose connections.
5.2. OBD-II Scanner
Use an OBD-II scanner to retrieve any diagnostic trouble codes (DTCs) related to the NOx sensor. This can provide valuable information about the nature of the problem. At CARDIAGTECH.BIZ, we offer a variety of OBD-II scanners to suit your needs.
5.3. Multimeter Testing
A multimeter can be used to check the sensor’s voltage and resistance. Refer to the vehicle’s service manual for the correct values and testing procedures.
5.4. Oscilloscope Testing
An oscilloscope can be used to monitor the sensor’s signal output. This can help identify intermittent problems or signal irregularities.
5.5. Professional Diagnostic Tools
Advanced diagnostic tools, such as those available at CARDIAGTECH.BIZ, can perform more comprehensive testing of the NOx sensor, including simulating different operating conditions and monitoring the sensor’s response.
6. NOx Sensor Replacement: A Step-by-Step Guide
Replacing a NOx sensor is a task that can be accomplished with the right tools and knowledge. Here’s a step-by-step guide to help you through the process. Always consult your vehicle’s service manual for specific instructions and safety precautions.
6.1. Gather Your Tools and Materials
Before you begin, make sure you have all the necessary tools and materials:
- New NOx sensor (ensure it is the correct part for your vehicle)
- OBD-II scanner (available at CARDIAGTECH.BIZ)
- Wrench set
- Socket set
- Screwdrivers
- Penetrating oil
- Gloves
- Safety glasses
- Vehicle service manual
6.2. Prepare the Vehicle
- Safety First: Park the vehicle on a level surface, engage the parking brake, and allow the engine to cool completely.
- Locate the NOx Sensor: Consult your vehicle’s service manual to find the location of the NOx sensor. It is typically located in the exhaust system, either before or after the catalytic converter or SCR catalyst.
6.3. Disconnect the Old Sensor
- Disconnect Electrical Connector: Carefully disconnect the electrical connector from the NOx sensor. Be gentle to avoid damaging the connector or wiring.
- Apply Penetrating Oil: Spray penetrating oil onto the threads of the sensor to help loosen it. Let it sit for about 10-15 minutes.
- Remove the Sensor: Use the appropriate wrench or socket to carefully unscrew the NOx sensor. Be patient and apply steady pressure to avoid stripping the threads. If the sensor is stuck, apply more penetrating oil and try again.
6.4. Install the New Sensor
- Clean the Threads: Clean the threads of the sensor mounting location with a wire brush to remove any debris or corrosion.
- Apply Anti-Seize Compound: Apply a small amount of anti-seize compound to the threads of the new NOx sensor. This will help prevent corrosion and make it easier to remove the sensor in the future.
- Install the New Sensor: Carefully screw the new NOx sensor into place by hand. Then, use the wrench or socket to tighten it to the manufacturer’s specified torque. Do not overtighten, as this can damage the sensor or the exhaust system.
- Reconnect Electrical Connector: Reconnect the electrical connector to the new NOx sensor, ensuring it is securely attached.
6.5. Verify the Installation
- Start the Engine: Start the engine and let it run for a few minutes. Check for any exhaust leaks around the sensor.
- Use OBD-II Scanner: Use an OBD-II scanner to clear any diagnostic trouble codes (DTCs) related to the old NOx sensor.
- Monitor Performance: Monitor the vehicle’s performance and emissions to ensure the new sensor is working correctly.
7. Benefits of Using High-Quality NOx Sensors from CARDIAGTECH.BIZ
Choosing the right NOx sensor is crucial for ensuring optimal engine performance and emissions control. At CARDIAGTECH.BIZ, we offer high-quality NOx sensors that provide numerous benefits.
7.1. Superior Quality and Reliability
Our NOx sensors are sourced from reputable manufacturers known for their quality and reliability. They are designed to meet or exceed OEM specifications, ensuring accurate and consistent performance.
7.2. Enhanced Durability
Our sensors are built to withstand the harsh conditions of the exhaust system, including high temperatures, vibrations, and corrosive gases. This ensures a longer lifespan and reduces the need for frequent replacements.
7.3. Accurate Readings
Our NOx sensors provide precise and reliable readings, allowing the engine control unit (ECU) to optimize the air-fuel mixture and other parameters for efficient combustion and reduced emissions.
7.4. Improved Engine Performance
By providing accurate data, our sensors help improve engine performance, including increased power, better fuel economy, and smoother idling.
7.5. Regulatory Compliance
Our NOx sensors help ensure that your vehicle meets emissions standards, avoiding potential fines and ensuring legal operation.
7.6. Wide Compatibility
We offer a wide range of NOx sensors compatible with various diesel and lean-burn engines, making it easy to find the right sensor for your vehicle.
7.7. Expert Support
At CARDIAGTECH.BIZ, we have a team of knowledgeable experts who can help you choose the right NOx sensor for your vehicle and provide technical support during installation and troubleshooting. Contact us at Whatsapp: +1 (641) 206-8880 for expert assistance.
8. Maintaining Your NOx Sensor
Proper maintenance can extend the life of your NOx sensor and ensure optimal performance. Here are some tips for maintaining your NOx sensor:
8.1. Use High-Quality Fuel
Using high-quality fuel can reduce the amount of soot and other contaminants that can damage the sensor.
8.2. Regular Inspections
Regularly inspect the sensor and its wiring for any signs of damage, such as cracks, corrosion, or loose connections.
8.3. Address Engine Problems Promptly
Address any engine problems, such as oil leaks or coolant leaks, promptly to prevent contamination of the sensor.
8.4. Avoid Fuel Additives
Avoid using fuel additives that can leave deposits on the sensor.
8.5. Follow Maintenance Schedule
Follow the manufacturer’s recommended maintenance schedule for your vehicle, including regular oil changes and other services that can help prevent engine problems that can affect the sensor.
9. The Role of NOx Sensors in Selective Catalytic Reduction (SCR) Systems
NOx sensors play a critical role in Selective Catalytic Reduction (SCR) systems, which are widely used in diesel engines to reduce NOx emissions. SCR systems use a catalyst and a reducing agent, typically urea (also known as Diesel Exhaust Fluid or DEF), to convert NOx into nitrogen and water.
9.1. Monitoring NOx Levels
NOx sensors are used to monitor the levels of NOx entering and exiting the SCR catalyst. This information is used to control the injection of DEF into the exhaust stream.
9.2. Optimizing DEF Injection
The engine control unit (ECU) uses the data from the NOx sensors to adjust the amount of DEF injected into the exhaust stream. This ensures that the correct amount of DEF is used to reduce NOx emissions without wasting DEF or causing other problems.
9.3. Ensuring System Efficiency
By monitoring the efficiency of the SCR catalyst, NOx sensors help ensure that the system is working properly and meeting emissions standards. If the catalyst is not working efficiently, the ECU can take corrective action, such as adjusting the DEF injection rate or triggering a warning light.
9.4. Preventing Over-Injection of DEF
Over-injection of DEF can lead to several problems, including:
- Ammonia Slip: Excess DEF can result in ammonia being released into the atmosphere, which is also a pollutant.
- Catalyst Damage: Over time, excessive DEF can damage the SCR catalyst.
- Reduced Fuel Economy: Over-injection of DEF can reduce fuel economy.
NOx sensors help prevent these problems by providing accurate data on NOx levels, allowing the ECU to control the DEF injection rate precisely.
10. Understanding OBD II Error Codes Related to NOx Sensors
When a NOx sensor malfunctions, it triggers specific OBD II error codes. Understanding these codes can help you diagnose the problem and take appropriate action. Here are some common OBD II error codes related to NOx sensors:
Code | Description | Possible Causes |
---|---|---|
P2200 | NOx Sensor Circuit | Faulty NOx sensor, wiring problems, connector issues, ECU malfunction |
P2201 | NOx Sensor Circuit Range/Performance | Faulty NOx sensor, exhaust leaks, incorrect sensor installation |
P2202 | NOx Sensor Circuit Low | Short circuit in the wiring, faulty NOx sensor, poor connection |
P2203 | NOx Sensor Circuit High | Open circuit in the wiring, faulty NOx sensor, poor connection |
P2204 | NOx Sensor Circuit Intermittent | Intermittent wiring problems, loose connections, faulty NOx sensor |
P2205 | NOx Sensor Heater Control Circuit/Open | Faulty NOx sensor, open circuit in the heater control circuit, wiring problems |
P2206 | NOx Sensor Heater Control Circuit Low | Short circuit in the heater control circuit, faulty NOx sensor, wiring problems |
P2207 | NOx Sensor Heater Control Circuit High | Open circuit in the heater control circuit, faulty NOx sensor, wiring problems |
P2208 | NOx Sensor Heater Sense Circuit | Faulty NOx sensor, wiring problems, connector issues, ECU malfunction |
P2209 | NOx Sensor Heater Sense Circuit Range/Performance | Faulty NOx sensor, exhaust leaks, incorrect sensor installation |
P2210 | NOx Sensor Heater Sense Circuit Low | Short circuit in the wiring, faulty NOx sensor, poor connection |
P2211 | NOx Sensor Heater Sense Circuit High | Open circuit in the wiring, faulty NOx sensor, poor connection |
P2212 | NOx Sensor Heater Sense Circuit Intermittent | Intermittent wiring problems, loose connections, faulty NOx sensor |
P2BA7 | NOx Exceedence – Empty Reagent Tank | Empty DEF tank, faulty DEF level sensor, DEF system problems |
P2BA8 | NOx Exceedence – Interruption of Reagent Dosing Activity | Faulty DEF injector, DEF pump problems, SCR catalyst issues |
P2BA9 | NOx Exceedence – Insufficient Reagent Quality | Contaminated DEF, incorrect DEF formulation, DEF system problems |
P2BAA | NOx Exceedence – Low Reagent Consumption | Faulty DEF injector, DEF pump problems, SCR catalyst issues |
U029D | Lost Communication With NOx Sensor “A” | Wiring problems, faulty NOx sensor, ECU malfunction, CAN bus issues |
U029E | Lost Communication With NOx Sensor “B” | Wiring problems, faulty NOx sensor, ECU malfunction, CAN bus issues |
U059E | Invalid Data Received From NOx Sensor “A” | Faulty NOx sensor, wiring problems, ECU malfunction |
U059F | Invalid Data Received From NOx Sensor “B” | Faulty NOx sensor, wiring problems, ECU malfunction |
P2000 | NOx Adsorber Efficiency Below Threshold | Faulty NOx adsorber, exhaust leaks, incorrect sensor installation |
P2001 | NOx Adsorber Efficiency Below Threshold | Faulty NOx adsorber, exhaust leaks, incorrect sensor installation |
P20EC | SCR NOx Catalyst – Over Temperature | Overheating SCR catalyst, faulty temperature sensor, exhaust system problems |
P20ED | SCR NOx Pre-Catalyst – Over Temperature | Overheating pre-catalyst, faulty temperature sensor, exhaust system problems |
P20EE | SCR NOx Catalyst Efficiency Below Threshold | Faulty SCR catalyst, DEF system problems, exhaust leaks |
P20EF | SCR NOx Pre-Catalyst Efficiency Below Threshold | Faulty pre-catalyst, DEF system problems, exhaust leaks |
P20F0 | SCR NOx Catalyst – Over Temperature | Overheating SCR catalyst, faulty temperature sensor, exhaust system problems |
P20F1 | SCR NOx Pre-Catalyst – Over Temperature | Overheating pre-catalyst, faulty temperature sensor, exhaust system problems |
P20F2 | SCR NOx Catalyst Efficiency Below Threshold | Faulty SCR catalyst, DEF system problems, exhaust leaks |
P20F3 | SCR NOx Pre-Catalyst Efficiency Below Threshold | Faulty pre-catalyst, DEF system problems, exhaust leaks |
10.1. Diagnosing and Addressing Error Codes
When you encounter one of these error codes, it’s important to diagnose the underlying problem accurately. Here are some steps to take:
- Use an OBD-II Scanner: Use an OBD-II scanner to confirm the error code and gather additional information.
- Inspect Wiring and Connectors: Check the wiring and connectors associated with the NOx sensor for any signs of damage or corrosion.
- Test the Sensor: Use a multimeter or oscilloscope to test the sensor’s voltage and resistance.
- Check for Exhaust Leaks: Inspect the exhaust system for any leaks, which can affect the sensor’s readings.
- Replace the Sensor: If the sensor is faulty, replace it with a high-quality sensor from CARDIAGTECH.BIZ.
- Clear the Code: After addressing the problem, use the OBD-II scanner to clear the error code and monitor the vehicle’s performance.
11. Frequently Asked Questions (FAQs) About NOx Sensors
Here are some frequently asked questions about NOx sensors:
11.1. What is a NOx sensor and what does it do?
A NOx sensor measures the concentration of nitrogen oxides (NOx) in the exhaust gas of diesel and lean-burn engines, helping to reduce emissions and optimize engine performance.
11.2. Where is the NOx sensor located?
The NOx sensor is typically located in the exhaust system, either before or after the catalytic converter or SCR catalyst.
11.3. How do I know if my NOx sensor is bad?
Common symptoms include the check engine light, reduced engine performance, increased emissions, difficulty starting, and engine stalling.
11.4. Can I drive with a bad NOx sensor?
While it may be possible to drive with a bad NOx sensor, it is not recommended. A faulty sensor can lead to reduced engine performance, increased emissions, and potential damage to other components.
11.5. How much does it cost to replace a NOx sensor?
The cost to replace a NOx sensor can vary depending on the vehicle and the sensor itself. Generally, the cost ranges from $300 to $800, including parts and labor.
11.6. Can I replace the NOx sensor myself?
Yes, you can replace the NOx sensor yourself if you have the necessary tools and knowledge. However, it is important to follow the correct procedures and safety precautions. If you are not comfortable performing the replacement yourself, it is best to take the vehicle to a professional mechanic.
11.7. How often should I replace my NOx sensor?
The lifespan of a NOx sensor typically ranges from 80,000 to 120,000 miles, depending on the vehicle and operating conditions.
11.8. What is the role of NOx sensors in SCR systems?
NOx sensors monitor the levels of NOx entering and exiting the SCR catalyst, helping to optimize the injection of DEF and ensure that the system is working properly.
11.9. What are some common OBD II error codes related to NOx sensors?
Common codes include P2200, P2201, P2202, P2203, and others, indicating circuit malfunctions, range/performance issues, or high/low signals.
11.10. Where can I buy high-quality NOx sensors?
You can buy high-quality NOx sensors at CARDIAGTECH.BIZ. We offer a wide range of sensors compatible with various diesel and lean-burn engines. Contact us at Whatsapp: +1 (641) 206-8880 for expert assistance.
12. Why Choose CARDIAGTECH.BIZ for Your Automotive Diagnostic Needs?
At CARDIAGTECH.BIZ, we are committed to providing our customers with the highest quality automotive diagnostic tools and replacement parts. Here are some reasons why you should choose us for your NOx sensor and other automotive needs:
12.1. Extensive Product Range
We offer a wide range of NOx sensors, OBD-II scanners, and other diagnostic tools to suit various vehicles and applications.
12.2. High-Quality Products
Our products are sourced from reputable manufacturers known for their quality and reliability.
12.3. Competitive Prices
We offer competitive prices on all our products, ensuring you get the best value for your money.
12.4. Expert Support
Our team of knowledgeable experts can help you choose the right products for your needs and provide technical support during installation and troubleshooting. Contact us at Whatsapp: +1 (641) 206-8880 for expert assistance.
12.5. Fast Shipping
We offer fast and reliable shipping to get you the products you need quickly.
12.6. Customer Satisfaction
We are committed to customer satisfaction and strive to provide the best possible shopping experience.
Conclusion
NOx sensors are critical components in modern diesel and lean-burn engines, helping to reduce emissions, comply with regulations, and optimize engine performance. Understanding their function, symptoms of failure, and maintenance requirements can help you keep your vehicle running smoothly and efficiently. At CARDIAGTECH.BIZ, we offer high-quality NOx sensors and diagnostic tools to meet all your automotive needs. Explore our website or contact us today for expert assistance. Don’t let a faulty NOx sensor compromise your vehicle’s performance and environmental compliance. Trust CARDIAGTECH.BIZ to provide you with the best solutions. Contact us now at Whatsapp: +1 (641) 206-8880 or visit our location at 276 Reock St, City of Orange, NJ 07050, United States.