PRC7918 - Transmitter Temperature Sensor Coolant Range Rover Classic. 3.9 Electrical Part Land Rover Range Rover Discovery, Range Rover

PRC7918 - Coolant Temperature Sensor – 3.9 V8

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Coolant temperature transducer for the 3.9L V8 EFI petrol engine, part of the engine management sensing circuit.

Threads into the coolant passage at the inlet manifold and reports coolant temperature to the engine control unit, which uses the signal to enrich fuelling during warm-up and to correct the mixture once the engine reaches operating temperature.

A failed or drifting transducer typically shows up as poor cold starting, uneven idle and raised fuel consumption.

Vehicle Model Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994

Fitment Notes RANGE ROVER CLASSIC 1986-1991 (to VIN HA610293) — Coolant temperature transducer, 3.9 V8 EFI Petrol, on inlet manifold external pipes
RANGE ROVER CLASSIC 1992-1994 (from VIN JA610294) — Coolant temperature transducer, 3.9 V8 EFI Petrol, on inlet manifold

Alternative Codes

PRC7918

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Frequently asked questions

What does the PRC7918 coolant temperature sensor do?

The PRC7918 is a coolant temperature transducer for the 3.9L V8 EFI petrol engine. It threads into the coolant passage at the inlet manifold and reports coolant temperature to the engine control unit, which uses the signal to enrich fuelling during warm-up and correct the mixture at operating temperature.

Which models use this coolant temperature sensor?

This coolant temperature transducer fits the Range Rover Classic and Discovery 1 with the 3.9L V8 EFI petrol engine. On the Classic it mounts to the inlet manifold coolant passage. Confirm your engine is the 3.9 V8 EFI before ordering.

What are the symptoms of a faulty coolant temperature sensor?

A failed or drifting coolant temperature transducer typically shows as poor cold starting, uneven idle and raised fuel consumption. These appear because the ECU is enriching the mixture from an inaccurate temperature reading. It's worth confirming the sensor before chasing other fuelling faults.