P2201 Fault Code

NOx Sensor Circuit Range/Performance Bank 1

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

The P2201 fault code indicates an issue with the NOx sensor circuit for Bank 1. This sensor plays a crucial role in monitoring the levels of nitrogen oxides (NOx) emitted from the engine, helping to ensure that the vehicle complies with emission standards. A malfunction in this circuit can lead to performance problems and increased emissions.

What are the symptoms of the P2201 code?

Symptoms of a P2201 code may include:

• Check Engine Light illuminated
• Possible decrease in fuel efficiency
• Increased emissions leading to failed emissions tests
• Unusual engine performance characteristics such as reduced power or rough idling

What causes the P2201 code?

Common causes of the P2201 code include:

• Faulty NOx sensor
• Damaged wiring or connectors in the NOx sensor circuit
• Issues with the Engine Control Module (ECM) programming
• Fuel or air mixture problems affecting the sensor's performance

How to fix P2201?

To resolve the P2201 fault code, consider the following steps:

• Inspect the NOx sensor for physical damage or signs of wear
• Check the wiring and connectors for corrosion or disconnection
• Replace the NOx sensor if it is confirmed to be defective
• Update or reprogram the ECM if necessary
• Clear the fault codes and conduct a test drive to ensure the issue is resolved