P2AADDiesel Fuel Presence Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2AAD means the diesel presence sensor delivers an electrically valid signal whose content does not make sense: it may report diesel although no refuelling has taken place, never change at all, or contradict other information the engine computer has about the fuel. No manufacturer documents this code or its test publicly. Ford patent US10544031B2 illustrates the kind of cross-check involved in misfuelling detection: its pressure limit is not fixed but follows the pressure expected in the tank during that particular refill, so the verdict rests on a comparison instead of a single raw value. CARB requires such plausibility faults to be stored under their own code, apart from the circuit faults P2AAC, P2AAE and P2AAF. A contaminated or aged sensing element is a likely cause.
- What you may notice
- Check engine light on
- Unjustified misfuelling message, or a real misfuelling going unnoticed
- Likely causes
- LikelySensing element coated with deposits or residues
- PossibleSensor characteristic drifted with age
- RareCalibration of the plausibility check not suited to the fuel quality in use
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.