P01FFTurbocharger Outlet Pressure Sensor A/B 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
- Turbocharger outlet pressure sensor B is a second pressure sensor at a compressor outlet – for example one per turbo on twin-turbo engines or a second measuring point; sensor A has the codes P00F8–P00FC. It is a separate family from the boost pressure sensor: GM and Ford report the pressure ahead of the throttle under the boost sensor codes P0236–P0238. No manufacturer using the sensor B codes was found; FCA documents sensor A and a second outlet sensor. P01FF compares sensors A and B: with the engine off both should read barometric pressure, and in comparable operation they must agree within a tolerance. If they disagree without either being electrically faulty, this code sets; which one is wrong is found by comparing with barometric and manifold pressure. On twin-turbo engines a genuinely weaker turbo on one bank can also cause it.
- What you may notice
- Check engine light on
- Loss of power, boost limited
- Limp mode possible
- Likely causes
- LikelyOne sensor drifting
- PossibleLeak or hose damage between the measuring points or on one bank
- PossibleContact resistance at one sensor's connector or ground
- RareUneven turbo output (twin-turbo, wastegate or vanes on one side)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.