What does P1288 mean on a Ford?

P1288. Cylinder Head Temperature Sensor Out of Self-Test Range. Applies to F-150, Super Duty, Explorer, Escape with CHT sensors.

What causes P1288 on a Ford?

Self-test run on a cold engine Failing CHT sensor Corroded CHT connector Low coolant leaving the sensor exposed Wiring fault in the CHT circuit

How do I fix P1288 on a Ford?

Bring the engine to full operating temperature and re-run the test Check coolant level Inspect the CHT connector for corrosion Compare CHT to coolant temperature on a cold start Replace the sensor if the circuit is sound but readings stay out of range

Code

P1288

Cylinder Head Temperature Sensor Out of Self-Test Range

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-150, Super Duty, Explorer, Escape with CHT sensors
Related: P0118 Engine Coolant Temperature Circuit High Input on OBD Codes List

Findings, check these first

Self-test run on a cold engine
Failing CHT sensor
Corroded CHT connector
Low coolant leaving the sensor exposed
Wiring fault in the CHT circuit

Standard procedure

Bring the engine to full operating temperature and re-run the test
Check coolant level
Inspect the CHT connector for corrosion
Compare CHT to coolant temperature on a cold start
Replace the sensor if the circuit is sound but readings stay out of range

Code lookup

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Sources and review

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OBDII.pro: P1288 Ford definition
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Supports: Ford-family meaning for P1288: Cylinder Head Temp Sensor Out Of Self Test Range
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Last updated 2026-09-04.

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