P1289 — Cylinder Head Temperature (CHT) Sensor High Input
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1289 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1289 means on specific makes
Ford / Lincoln CAUTION
The CHT sensor signal is reading higher than its expected self-test range. Many modern Fords use a CHT sensor instead of (or alongside) an ECT sensor; a faulty reading can cause driveability or fan issues.
- Failed CHT sensor ($30-100)
- Wiring short/open at sensor ($20-100)
- Connector corrosion ($0-50)
Check first: Compare CHT sensor live data to actual engine temp; check the sensor circuit for shorts.
Source: TroubleCodes.net Ford list