P2216
NOx Sensor Circuit High Bank 2
Emissions / NOx sensor
Generic OBD-II
Low
What it means
P2216 means the bank 2 NOx sensor signal is higher than the expected range, typically from a wire shorted to voltage, an open circuit, or a failed sensor. The NOx sensor monitors exhaust nitrogen-oxide levels for the emissions system, so this mostly affects emissions and readiness rather than everyday driving — although some vehicles will limit performance to protect the system.
Low
Can I keep driving? Usually drivable — it's an emissions-sensor fault. Some vehicles limit power or SCR function to protect emissions, so don't leave it long.
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
- NOx sensor signal wire shorted to voltage or open (reads high)Likely
- Faulty bank 2 NOx sensorCommon
- Poor connection or corrosion at the sensor connectorCommon
- Chafed or damaged sensor harnessLess often
- Rarely, a faulty ECM/sensor moduleLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm it's the bank 2 NOx sensor circuit.
- Inspect the sensor connector and harness for a short to voltage, an open, or corrosion.
- Backprobe the signal circuit to see whether it's pinned high with the sensor unplugged vs. connected.
- Because the NOx sensor and module are one assembly, a confirmed sensor fault means replacement.
- Clear the code and verify the signal returns to range after a drive cycle.
FAQ
Quick answers
Is it safe to drive with P2216?+
Generally yes, but on diesel/SCR vehicles the emissions system may derate or warn, so plan to repair it.
Can I just clear P2216?+
It returns until the circuit fault or NOx sensor is repaired.
Related codes
Often seen with P2216
Read & clear P2216 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