OBD-II code · Powertrain (generic, extended)
P203E Reductant Level Sensor A Circuit Intermittent/Erratic
Reductant Level Sensor A Circuit Intermittent/Erratic: the signal is intermittent or erratic. Often a loose connector or chafed wiring; a wiggle test often locates it.
Is it safe to drive with P203E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCorroded sender contact
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Level Sensor
Related codes
- P203AReductant Level Sensor A Circuit
- P21ACReductant Level Sensor B Circuit Intermittent/Erratic
- P21B1Reductant Level Sensor C Circuit Intermittent/Erratic
- P203BReductant Level Sensor A Circuit Range/Performance
- P203CReductant Level Sensor A Circuit Low
- P203DReductant Level Sensor A Circuit High
- P203FReductant Level Too Low
- P2040Reductant Injection Air Pressure Sensor A Circuit High
- P2041Reductant Injection Air Pressure Sensor A Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.