NOx Sensor failure and how to solve

The NOx sensor in your vehicle plays a crucial role in reducing harmful emissions and ensuring your vehicle operates efficiently. However, like any other component in your vehicle, the NOx sensor can fail over time. In this article, we’ll discuss the common appearance of NOx sensor failure, error codes, and how to solve the issue.

Appearance of NOx Sensor Failure

The following are the common symptoms of NOx sensor failure in a vehicle:

1. Decreased Fuel Efficiency: A malfunctioning NOx sensor can cause the engine control unit to adjust the air-fuel ratio to reduce emissions, which can lead to decreased fuel efficiency.
2. Engine Warning Light: A faulty NOx sensor can trigger the check engine light on your dashboard. If this occurs, you should get your vehicle checked by a qualified technician.
3. Rough Idling: A malfunctioning NOx sensor can cause your engine to idle roughly or inconsistently.
4. Reduced Engine Power: A faulty NOx sensor can cause the engine control unit to limit the engine’s power to reduce emissions, which can lead to reduced engine power.

Error Codes

If your NOx sensor is failing, the engine control unit will store a diagnostic trouble code (DTC) in its memory. Here are some common error codes related to NOx sensor failure:

1. P2201: This error code indicates that there is a problem with the NOx sensor circuit, and the signal is out of range.
2. P2203: This error code indicates that there is a problem with the NOx sensor circuit, and the signal is too high.
3. P2204: This error code indicates that there is a problem with the NOx sensor circuit, and the signal is too low.

Solving the Issue

If your vehicle is exhibiting any of the symptoms mentioned above or has triggered an error code related to the NOx sensor, you should get it checked by a qualified technician. Here are some common solutions to NOx sensor failure:

1. Replacement: If your NOx sensor is faulty, it will need to be replaced. It is essential to use the correct OE number for your specific make and model to ensure compatibility.
2. Cleaning: Sometimes, the NOx sensor can become clogged with carbon deposits, leading to incorrect readings. In such cases, cleaning the sensor may help solve the issue.
3. Wiring: In some cases, the issue may be with the wiring connecting the NOx sensor to the engine control unit. A qualified technician can inspect the wiring and repair or replace any damaged wires.

In conclusion, NOx sensor failure can lead to decreased fuel efficiency, engine warning lights, rough idling, and reduced engine power. If you suspect your NOx sensor is failing, get it checked by a qualified technician who can diagnose and repair the issue. Remember, regular maintenance and inspections can help prevent NOx sensor failure and keep your vehicle running smoothly.