P2204 Fault Code

NOx Sensor Circuit Intermittent Bank 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2204 fault code refers to an issue with the NOx sensor circuit on Bank 1, which is responsible for measuring the level of nitrogen oxides in the exhaust gases. This sensor plays a critical role in managing the engine's emissions and overall performance by providing feedback for the engine control unit (ECU). When the circuit experiences intermittent problems, it can lead to inaccurate readings and trigger the check engine light.

What are the symptoms of the P2204 code?

If your vehicle has a P2204 code, you may experience:

• Check engine light illuminated on the dashboard
• Poor engine performance or reduced fuel efficiency
• Increased emissions output
• In some cases, you may notice rough idling or hesitation during acceleration.

What causes the P2204 code?

Common causes of the P2204 fault code may include:

• Faulty NOx sensor on Bank 1
• Damaged or corroded wiring or connectors in the NOx sensor circuit
• Poor electrical connections or short circuits in the circuit
• Issues with the engine control module (ECM) or software bugs
• Exhaust leaks that can affect sensor readings.

How to fix P2204?

To resolve the P2204 fault code, you can follow these steps:

• Inspect the NOx sensor and its wiring for any visible damage or corrosion. Replace any faulty components as necessary.
• Check electrical connections for cleanliness and ensure they are secure.
• Examine the exhaust system for leaks that could affect sensor readings.
• Clear the fault code using an OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• If problems persist, consider consulting a professional to diagnose potential issues with the ECM.