P2207 Fault Code

NOx Sensor Heater Control Circuit High Bank 1

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

The P2207 fault code indicates a problem with the NOx sensor heater control circuit for bank 1. This sensor is crucial for monitoring nitrogen oxide emissions, and its heater element is responsible for ensuring the sensor operates within the optimal temperature range. When this code is triggered, it means that the control circuit for the heater is drawing too much voltage, which can lead to incorrect readings and increased emissions.

What are the symptoms of the P2207 code?

• Check Engine Light (CEL) illuminated.
• Increased NOx emissions leading to potential failure in emissions testing.
• Poor engine performance or reduced fuel efficiency.
• Possible uneven running of the engine at different speeds.

What causes the P2207 code?

• Short circuit in the wiring harness.
• Faulty NOx sensor heater.
• Malfunctioning Engine Control Unit (ECU).
• Poor electrical connections or damaged connectors.
• Issues with the vehicle’s exhaust system affecting sensor operation.

How to fix P2207?

• Inspect the wiring and connectors for damage or corrosion.
• Test the NOx sensor heater with a multimeter to confirm it is functioning properly.
• Replace the NOx sensor if it is found to be defective.
• Repair or replace any damaged wiring and connectors that could affect the heater circuit.
• Clear the fault code after repairs and conduct a test drive to ensure the issue is resolved.