NOx Sensor Heater Control Circuit/Open Bank 1
The P2205 code indicates a problem with the heater circuit of the NOx sensor on Bank 1. The NOx sensor measures nitrogen oxide levels in the exhaust and requires a heater to reach operating temperature quickly. An open circuit means the heater element or its wiring is broken, preventing the sensor from functioning properly. This can lead to increased emissions and potential drivability issues.
01. Most Common Causes
- Faulty NOx sensor
- Open or shorted wiring in the heater circuit
- Blown fuse related to the NOx sensor heater
- Corroded or damaged connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible reduced fuel economy
- Engine may enter limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for codes and document freeze frame data.
Step 2: Visually inspect the NOx sensor connector and wiring for damage or corrosion.
Step 3: Check the heater circuit fuse and replace if blown.
Step 4: Using a multimeter, measure resistance across the heater pins of the NOx sensor; compare to manufacturer specs.
Step 5: If resistance is out of range, replace the NOx sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but the vehicle may fail emissions and could experience reduced performance. It's best to repair promptly.
How much does it cost to fix?▼
Replacing the NOx sensor typically costs $200-$500 including parts and labor.