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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21853
Experience:  BEng hons Mech engineering, in auto industry 22 years
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puegeot 308 sd 1.6turbo diesel. low oil pressure warning. instructed

Resolved Question:

puegeot 308 sd 1.6turbo diesel. low oil pressure warning. instructed to stop immediately. possible causes?
Submitted: 3 years ago.
Category: Car
Expert:  Matt replied 3 years ago.
Hello

I'd 1st suggest measuring the actual oil pressure with separate mechanical gauge - this can be plumbed into the engine via the current pressure switch port - if you use a Tee piece you can keep the pressure switch plumbed in as well and so see if the low pressure light corresponds to a low pressure reading.

If its intermittent and you have no rumbling or rattling noises from the engine its likely to be an electrical fault so 1st check the connection to the pressure switch is bright and clean and check back along the switch wiring for any signs of damage to the insulation

As if the wire is grounded out at any point then this will also turn on the light.

if this is all OK and the oil pressure is at least 1.3Bar ( 20psi) at hot idle then replace the switch

If you do have a low pressure reading and to turn on the light it will be very low about 5psi then replace the oil pump and ensure that the pump pickup in the sump hasn't come loose or is blocked
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