P2204:NOx Sensor Circuit Intermittent (Bank 1 Sensor 1)

P2204 is an OBD-II trouble code that stands for “NOx Sensor Circuit Intermittent (Bank 1 Sensor 1)”. This code is set when the engine’s computer (PCM) detects an intermittent fault in the NOx sensor circuit for Bank 1, Sensor 1.

The NOx sensor is a type of emissions sensor that helps to reduce nitrogen oxide (NOx) emissions from diesel engines. NOx is a harmful gas that can contribute to smog and acid rain. The NOx sensor works by measuring the concentration of NOx in the exhaust gas. The PCM uses this information to adjust the engine’s fuel and air mixture to reduce NOx emissions.

If the PCM detects an intermittent fault in the NOx sensor circuit, it will set P2204 and illuminate the check engine light. This code can be caused by a number of things, including:

• A faulty NOx sensor
• A damaged NOx sensor wiring harness
• A loose or corroded NOx sensor connector
• A problem with the PCM

If P2204 is set, it is important to have the vehicle diagnosed and repaired as soon as possible. Driving with a P2204 code can damage the engine and increase emissions.

Here are some of the symptoms of P2204:

• Check engine light illuminated
• Engine misfires
• Reduced fuel economy
• Black smoke from the exhaust
• Engine power loss

If you are experiencing any of these symptoms, it is important to have your vehicle diagnosed by a qualified mechanic.