85 Adaptive fuel lean limit reached or canister purge circuit failure
How to read it
Code 85 reads as 8 flashes, pause, 5 flashes on the check-engine light. Jumper the self-test input to signal return at the test connector, then run the key on engine off self test and the running self test, counting the check-engine flashes each time.
New to flash codes? The OBD-I code reading guide walks through the paperclip method, code 12, and reading two-digit codes.
What does Ford code 85 mean?
85. Adaptive fuel lean limit reached or canister purge circuit failure. This code sets when your vehicle computer detects adaptive fuel lean limit reached or canister purge circuit failure.
Common causes of 85
- Vacuum or intake leak
- Low fuel pressure or clogged filter
- Dirty or weak fuel injectors
- Faulty canister purge solenoid or circuit
- Faulty oxygen sensor
How to fix 85
- Confirm the code and check for vacuum and intake leaks
- Measure fuel pressure and check the filter
- Test the canister purge solenoid and its circuit
- Watch the oxygen sensor signal for a true lean reading
- Repair leaks or replace a failed part only after the tests