OBD-II code · Powertrain (generic, extended)
P2202 NOx Sensor Circuit Low (Bank 1)
The NOx sensor signal on bank 1 is below the lower limit. Either short to ground on the analog return, sensor failed at low end, or pump cell stuck.
Is it safe to drive with P2202?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleSensor failed low
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Nox Sensor, Nox Sensor Wiring
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.