2B07
Moderate2B07 — NOx Sensor: Open or Short Circuit
Description
What the Code Means
2B07 points to an electrical fault in the NOx sensor circuit. The code is similar to 2AF4 but may refer to a different engine bank.
Normally the NOx sensor sends the DME data on nitrogen oxide concentration in the exhaust. An electrical failure in the circuit — an open, a short, or a loss of communication — leaves the control unit without that data.
Symptoms
Symptoms
- Check Engine light is on;
- the NOx sensor doesn't respond (no data reaching the DME).
Causes and fixes
Diagnosis and Repair
Step 1. Check the Wiring
Inspect the NOx sensor circuit wiring for opens, shorts, and damaged insulation.
Step 2. Replace the Sensor
If the wiring checks out, replace the NOx sensor.
Possible secondary damage
Secondary Issues
Losing the sensor signal can force the DME into a default rich mixture. Running permanently rich while the fault is ignored isn't intended as a long-term operating mode.