NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1
What it means
P2206 means the control circuit for the bank 1, sensor 1 NOx sensor heater is reading low, usually from a short to ground, a bad connection, or a failed heater element. The NOx sensor needs its heater to reach operating temperature and monitor emissions, so it mostly affects the emissions system rather than daily driving — though some vehicles derate to protect it.
Can I keep driving? Usually drivable — it's an emissions-sensor fault. Some vehicles limit power or DEF/SCR function to protect emissions, so don't leave it long.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Often no change in how the car drives
- Possible reduced power or emissions warning on diesels/SCR vehicles
- Fails an emissions/readiness test
Common causes
Most likely first
- Signal or heater wire shorted to ground (drives the control voltage low)Likely
- Faulty NOx sensor heater elementCommon
- Poor connection or corrosion at the NOx sensor connectorCommon
- Chafed or damaged sensor harnessLess often
- Rarely, a faulty ECM/sensor module driverLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm it's the bank 1, sensor 1 NOx heater circuit.
- Inspect the NOx sensor connector and harness for a short to ground, corrosion, or chafing.
- Check the heater circuit resistance and confirm it gets power and a good ground.
- Because the sensor and its module are one assembly, a failed heater usually means sensor replacement.
- Clear the code and confirm the heater circuit stays in range after a drive cycle.
FAQ
Quick answers
Is it safe to drive with P2206?+
Can I just clear P2206?+
Related codes
Read & clear P2206 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.