P2202 Fault Code

NOx Sensor Circuit Low Bank 1

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

The P2202 fault code indicates a problem with the NOx (Nitrogen Oxide) sensor circuit, specifically related to Bank 1. This sensor is crucial for monitoring the levels of nitrogen oxides in the exhaust gases, which helps in managing emissions and ensuring compliance with environmental regulations. When the circuit is low, it can cause inadequate readings, leading to increased emissions and potential engine performance issues.

What are the symptoms of the P2202 code?

Common symptoms of a P2202 fault code may include:

• The check engine light illuminating on the dashboard.
• Reduced engine performance due to erroneous sensor readings.
• Failed emissions tests due to excessive NOx levels in exhaust.
• Increased fuel consumption as the engine may run less efficiently.

What causes the P2202 code?

The low circuit condition can be caused by various factors, including:

• Damaged or shorted wiring or connectors related to the NOx sensor.
• A faulty NOx sensor that is unable to provide the correct voltage or signal.
• Issues within the engine management system, such as bad ground connections or software faults that affect sensor readings.

How to fix P2202?

To resolve the P2202 code, the following steps should be taken:

• Inspect the wiring and connectors for the NOx sensor to check for physical damage, corrosion, or loose connections.
• Test the NOx sensor to ensure it functions within manufacturer specifications; replace it if faulty.
• Check for proper grounding to the engine management system and repair any issues found.
• After repairs, clear the fault codes and perform a test drive to ensure the issue is resolved and the check engine light does not return.