221 Spark timing error
How to read it
Code 221 reads as 2 flashes, pause, 2 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 221 mean?
221. Spark timing error. This code sets when your vehicle computer detects spark timing error.
Common causes of 221
- Faulty spark timing circuit
- Open or shorted wiring in the ignition circuit
- Corroded or loose connector at the spark timing circuit
- Faulty ignition control module or coil pack
- Faulty PCM ignition output
How to fix 221
- Confirm the code and read the flash sequence again
- Inspect the spark timing circuit and the ignition wiring for damage and corrosion
- Test the spark timing circuit signal while cranking or running
- Repair wiring or a connector before replacing parts
- Replace the spark timing circuit or ignition module only after the signal test fails