Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information
The P1289 code means the vehicle's onboard diagnostic system has detected: Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. P1289 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
Common Symptoms
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
Probable Causes (Ranked by Likelihood)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Common Fixes by Vehicle
What techs usually find when diagnosing P1289 on specific vehicles — tap your vehicle for the fix and the exact part:
1997-2004 Ford F-150/Expedition/Lincoln Navigator 4.6L/5.4L moderate DIY
Ford P1289 = Cylinder Head Temperature (CHT) sensor high voltage. Sensor threads into the driver-side cylinder head near the front. Replace with an OE-quality Motorcraft unit. Access is tight; remove air intake tube for better access. This sensor replaces the coolant temp sensor on some Triton engines and protects against dry-start damage. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 30-60 min2005-2010 Ford Mustang 4.6L V8 moderate DIY
Mustang 4.6L P1289 is CHT sensor fault. Replacement is Motorcraft. If the engine has recently run low on coolant and overheated, the head may be warped -- check for coolant consumption and white smoke before just replacing the sensor. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 45 min2001-2007 Ford Explorer/Sport Trac 4.0L SOHC moderate DIY
4.0L SOHC P1289 = CHT sensor high. The sensor is behind the upper intake manifold, requiring intake removal. Replace sensor (Motorcraft) and inspect timing chain tensioners while the intake is off -- these are known weak points on this engine. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 1-2 hoursFrequently Asked Questions
Does P1289 mean the same thing on every vehicle?
No. P1289 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does P1289 most likely indicate?
Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information. Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
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Confirm your exact make, model, and year first — P1289 is manufacturer-specific and can mean different things across brands.
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Read P1289 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Commonly Affected Vehicles
- 2000-2006 Toyota Hilux Diesel
- 2000-2007 Toyota Land Cruiser Diesel
- 2001-2005 Toyota RAV4 Diesel
- 2003-2009 Toyota Avensis Diesel
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