OBD
P0169
Incorrect Fuel Composition
What it means
P0169 means Incorrect Fuel Composition.
Check these first
- The wrong fuel in the tank
- A failed fuel composition sensor
- Contaminated fuel
- A wiring fault on the fuel composition sensor
- A faulty ECM fuel strategy
What to do next
- Verify the fuel type in the tank
- Read the fuel composition on a scan tool
- Test the fuel composition sensor
- Drain and refill with the correct fuel
- Replace the fuel composition sensor if faulty
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.