NOx Sensor Heater Control Circuit High Bank 1
The P2207 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the heater control circuit of the nitrogen oxide (NOx) sensor for Bank 1. This sensor is part of the selective catalytic reduction (SCR) system used to reduce emissions. The heater is essential for the sensor to reach operating temperature quickly, especially in cold conditions. A high voltage reading suggests a short to power, a faulty sensor, or a wiring issue.
01. Most Common Causes
- Faulty NOx sensor (Bank 1)
- Short to voltage in the heater control circuit
- Damaged wiring or connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Increased emissions
- Possible reduced engine performance
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the NOx sensor wiring and connector for damage, corrosion, or loose pins.
Step 3: Measure voltage at the heater control circuit; compare to manufacturer specifications.
Step 4: Test the NOx sensor heater resistance with a multimeter; replace if out of range.
Step 5: If wiring and sensor are okay, check for PCM issues or software updates.
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 testing and could enter limp mode. It's best to repair promptly.
How much does it cost to fix?▼
Typically $200-$600, including parts (NOx sensor) and labor. Costs vary by vehicle make and shop rates.