How do I fix Ford code 341?

Check the circuit wiring and harness for damage, chafing or a poor splice Check the base ignition timing and the fuel octane Test the ECM last, only after every circuit test has passed Clear the code, then retest to confirm the fix holds

341 Octane adjust service pin open

Q: What does Ford code 341 mean?

Ford code 341. Octane adjust service pin open. Applies to 1981-1995 Ford, Lincoln and Mercury EEC-IV vehicles.

Make: Ford (1981-1995)
Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: 1981-1995 Ford, Lincoln and Mercury EEC-IV vehicles

How to read it

Code 341 reads as 3 flashes, pause, 4 flashes, pause, 1 flash 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 341 mean?

341. Octane adjust service pin open. This code sets when your vehicle computer detects octane adjust service pin open.

Common causes of 341

Wiring
Octane adjuster
ECM

How to fix 341

Check the circuit wiring and harness for damage, chafing or a poor splice
Check the base ignition timing and the fuel octane
Test the ECM last, only after every circuit test has passed
Clear the code, then retest to confirm the fix holds