P00CFBarometric Pressure - Turbocharger/Supercharger Boost Sensor A Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- With the engine stopped or without boost, the boost pressure sensor A (between compressor and throttle) must read practically ambient pressure. This code is set when it deviates from the barometric pressure sensor by more than a threshold; the code does not say which of the two is wrong. Manufacturers that publish their diagnostics run the same comparison under other codes. None of the published manufacturer documents searched uses this code; the explanation follows regulations and comparable manufacturer monitors.
- What you may notice
- Check engine light on
- Reduced boost or limp mode possible
- Often no further symptoms
- Likely causes
- LikelyBoost pressure sensor dirty, oil-coated or drifting
- PossibleBarometric sensor drifting, also when inside the control module
- PossibleContact resistance at connector, ground or 5 V reference
- PossibleSensor port or hose leaking or blocked
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.