Powertrain
generic / SAE
P24EE
NH3 Sensor Processor Performance
The microcontroller inside the smart NH3 slip sensor reports an internal performance fault — failed self-test, watchdog reset, or out-of-range plausibility checks. The sensor cannot guarantee its output value, the ECM marks the channel invalid and disables SCR closed-loop control on this branch.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / EE
Possible causes
- Internal processor or firmware fault high
- Brown-out from supply voltage dips medium
- Module software outdated, reflash may resolve low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–900 €
- Estimated time: 0.5–2 h
- Component: nh3 sensor
- Component: sensor microcontroller
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012