125 Throttle position sensor voltage lower than expected
How to read it
Code 125 reads as 1 flash, pause, 2 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 125 mean?
125. Throttle position sensor voltage lower than expected. This code sets when your vehicle computer detects throttle position sensor voltage lower than expected.
Common causes of 125
- Throttle tight/sticking
- Intake leak
- MAP/BARO sensor
- ECM
How to fix 125
- Check the throttle linkage and its adjustment, and look for a sticking valve
- Check for an intake leak
- Test the MAP/BARO sensor and replace it only if it fails its own test
- Test the ECM last, only after every circuit test has passed
- Clear the code, then retest to confirm the fix holds