NOx Sensor Circuit Bank 1 Malfunction
The P2200 code indicates a malfunction in the NOx sensor circuit for Bank 1. This sensor monitors nitrogen oxide levels in the exhaust to optimize diesel or lean-burn gasoline engine performance and emissions. The circuit includes the sensor, wiring, and the engine control module (ECM). A fault can cause incorrect readings, leading to poor fuel economy, increased emissions, and potential drivability issues.
01. Most Common Causes
- Faulty NOx sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced fuel economy
- Failed emissions test
- Possible limp mode or reduced power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P2200 is present.
Step 2: Visually inspect the NOx sensor and wiring for damage or corrosion.
Step 3: Test sensor circuit continuity and voltage using a multimeter.
Step 4: Replace the NOx sensor if circuit tests are normal but code persists.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor fuel economy and increased emissions. Prolonged driving could damage the catalytic converter or other components.
How much does it cost to fix?▼
Replacing the NOx sensor typically costs $200-$600 including parts and labor. Diagnosis may add $100-$150.