SOURCE: low oil warning light staying on oil level ok
would be best to have oil pressure checked with a mechanical gauge to be sure you have oil pressure.
hopefully you just have a bad oil pressure switch this is located on oil filter adapter rt above filter
SOURCE: oil light
you need to reset the oil life monitior in the cluster. look in your owners manual for "oil life monitor reset". I believe on that vehicle you have to turn the ignition on and depress the gas pedal 3 times rapidly within 5 seconds of turning the key to the "on" not the start position. the light will flash 5 times and it is reset. if you have your oil changed by a business then they should reset it for your for free.
SOURCE: Porsche 944 S2 inaccurate petrol gauge reading and oil level warning light
This is not a known solution, but in general these cars suffer from voltage and current drops on electrical connections due to corrosion on contact surfaces. I cannot remember the number of times I have read about electrical problems on these cars, and the problem was usually solved by cleaning the electrical contacts or replacing a relay going bad (BTW, this car does use a lot of relays however I doubt there is one in the fuel gauge circuit).
Also, I have a spare gauge cluster for the 944 and when I look at it, there are some resistors on the "printed circuit" piece. If one of those were to lose tolerance, or burn open, it would no doubt have an effect on the accuracy of the circuit. I would check out that circuitry and test the resistor values as a last resort -- it is not likely the gauge itself if it is working at all. However, before doing that I would clean the electrical contacts thoroughly. I have not tried to gain access to the wiring harnesses for the gauge cluster while it is in the car, but I doubt it is possible. So, if you have exhausted all other ideas go to the Clark's Garage site for instructions on how to remove the dash, and just follow the portion that applies to removing the gauge cluster. Go to the local electronics hobbyist store, or online, and obtain a good contact cleaner and clean all of the electrical contacts while also looking for loose or broken wires. NOTE: Be careful and gentle dealing with the plastic connectors on these cars as they tend to be brittle and little tabs break off easily if man-handled. Go slow, be in the right frame of mind and use good lighting so that you can see what you are doing.
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