P2210
NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 1
Auxiliary emissions control
Generic OBD-II
Medium
What it means
P2210 means the PCM sees a low-voltage fault in the heater sense circuit of the bank 1, sensor 1 NOx sensor. The heater brings the sensor up to operating temperature so it can read exhaust NOx; when its sense circuit reads low, the sensor can't do its emissions job. It usually traces to wiring or a failed NOx sensor.
Medium
Can I keep driving? Usually driveable, but it will fail emissions and, on many diesels, can trigger a reduced-power derate countdown, so don't leave it indefinitely.
Common symptoms
What you'll notice
- Check-engine light on
- Failed or incomplete emissions readiness
- On diesels: possible SCR/DEF warnings or a reduced-power (derate) countdown
- Often no noticeable change in how the engine drives
Common causes
Most likely first
- Faulty NOx sensor (bank 1, sensor 1) with an internal heater faultLikely
- Short to ground or open in the NOx heater sense wiringCommon
- Poor connector contact or corrosion at the sensor plugCommon
- Bad power or ground feed to the sensor's heater circuitLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for related NOx heater codes (P2209, P2211, P2212).
- Inspect the NOx sensor connector and heater wiring for damage, corrosion, and chafing.
- Check the heater sense circuit for a short-to-ground or open, and verify supply voltage and ground against spec.
- Clear the code and monitor whether the heater sense reading returns to range.
- If the circuit is good, replace the NOx sensor as specified (sensor and heater are one assembly).
FAQ
Quick answers
Is it safe to drive with P2210?+
It usually drives normally, but the sensor can't reach operating temperature, so it will fail emissions and on many diesels may start a derate countdown. Have it addressed.
Can I just clear P2210?+
It returns once the heater circuit runs again unless the low-voltage fault or the sensor is repaired.
Related codes
Often seen with P2210
Read & clear P2210 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX