Powertrain
generic / SAE
P20DF
Exhaust Aftertreatment Fuel Pressure Sensor Circuit Low
Aftertreatment fuel-pressure sensor below lower plausibility — short to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / DF
Possible causes
- Short to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–1000 €
- Estimated time: 0.7–3 h
- Component: aftertreatment fuel pressure sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012