P1285 Mercury Cylinder head over temp sensed

Possible causes

Low engine coolant level.

Base engine concerns.

Engine cooling system concerns.

CHT sensor concern.

Tech description

On some applications when this fault occurs the Engine Temperature warning indicator will illuminate and/or force the temperature gauge to the full H (hot) zone. The warning indicator can be triggered by either grounding the engine temperature warning circuit when wired to the PCM, or by sending a PCM network message to the instrument cluster.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1285 Mercury Description

Indicates an engine overheat condition was sensed by the Cylinder Head Temperature (CHT) sensor.