P0169Incorrect Fuel Composition
- 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
- According to its title, P0169 means the control module has detected a fuel composition outside what is expected – wrong fuel or an impermissible ethanol or water content – while the composition sensor itself works. None of the manufacturer OBD documents checked (GM, Ford) uses the code: GM reports water or conductive fuel via the ethanol sensor frequency as P2269, and Ford has had no composition sensor since 2000. Claims that diesel makers use it for misfuelling or water could not be verified. The description therefore rests on CARB, which lists the fuel composition sensor as a monitored component, and on component information. Unrecognised fuel usually also shows up as mixture adaptation codes.
- What you may notice
- Check engine light on
- Poor cold start, stumbling, loss of power
- Mixture adaptation codes (P0171/P0172)
- Higher consumption
- Likely causes
- LikelyWrong fuel (E85 in a non-flex-fuel vehicle, ethanol content outside calibration)
- PossibleWater or contamination in the fuel
- PossibleFuel composition sensor drifting (value in range but wrong)
- RareControl module software
- 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: €50 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.