Disco 1 oil pressure switch
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1st Gear
Joined: Apr 2026
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Disco 1 oil pressure switch
Can anyone confirm the location of the oil pressure switch and part number. My car specifically is the 1998 Discovery 1 anniversary edition. It is having some issues with oil pressure when idling and replacing the switch seems like the first step. Part number I am pretty sure is STC4104. Is it located just above the oil filter? Any other advice would be appreciated. I have limited tools and not a great place to work on it so if this is a pretty quick fix hopefully I am able to do it myself.
Recovery Vehicle
Joined: Dec 2019
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It is part #2 in diagram - yes STC4104
Oil Pressure Switch STC4104 For Land Rover Discovery I, Discovery Series II, Defender 90 And 110, Range Rover P38, And Range Rover Classic (See Fitment Notes) (Part #STC4104) - Land Rover switches, actuators & solenoids from Atlantic British
Oil Pressure Switch STC4104 For Land Rover Discovery I, Discovery Series II, Defender 90 And 110, Range Rover P38, And Range Rover Classic (See Fitment Notes) (Part #STC4104) - Land Rover switches, actuators & solenoids from Atlantic British
Last edited by disco96sd; Apr 30, 2026 at 10:01 AM.
Pro Wrench
Joined: Apr 2021
Posts: 1,410
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From: SE Washington State
Comes with metal seal washer for flat mating surfaces or a rubber o-ring for the tapered surface. Maybe try heavier weight oil, e.g. 10W-40 or 15W-40, that should raise the oil pressure compared to 5W-30.
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