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Oil Pressure Question

Powerdna
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Powerdna Member

Powerdna

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I recently noticed something "possibly" odd about my 2003 911 C2. After the engine/oil is to normal operating temperature I noticed that oil pressure gauge is between 4 and 5 in six gear, about 2k rpm, around 65 MPH. I noticed that every so often I get a blip on the oil gauge. Essentially similar to a pulse or surge however not an extreme variation (maybe 1/4 mark up or down). I am wondering if this is normal or something to be concerned about as my CPO warranty runs out in 1 month.

Thanks for any advice.

Andrew

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beauar Member

beauar

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it might be as little of a problem as the oil pressure sender is bad. I would have them look at that first. They will need to hook up a manual guage to the car to see if there trully is something wron with your oil pressure or if it is the cheap oil pressure sender unit which is around a $80 part. I had the same issue with my 2003 c2. The oil pressure would consistently get to 5 bar at low RPM's and sometimes I would get an oil pressure failure to go along with it. I had the sender unit replaced and everything has been smooth sailing. I haven't had one other problem with the car. Overall it has been really reliable. Good luck but I bet it is nothing to really worry about.

I recently noticed something "possibly" odd about my 2003 911 C2. After the engine/oil is to normal operating temperature I noticed that oil pressure gauge is between 4 and 5 in six gear, about 2k rpm, around 65 MPH. I noticed that every so often I get a blip on the oil gauge. Essentially similar to a pulse or surge however not an extreme variation (maybe 1/4 mark up or down). I am wondering if this is normal or something to be concerned about as my CPO warranty runs out in 1 month.

Thanks for any advice.

Andrew

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deckman Member

deckman

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I also experienced this with my '03 c2; more frustrating because each time I took it to the dealer I got the 'couldn't replicate' answer.

The sending unit completely failed several days before the warranty expired......

Same thing here, but my symptoms were nothing like the OP's. I don't know what it is, if anything. Maybe Loren will chime in.

Before your warranty expires, get under your car and look for any oil at the seem where the engine meets the transmission.

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beauar Member

beauar

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if the car is idling it should sit around 1.5 bar or so. You would notice that if you were under 3-4k RPMs that the oil pressure would be in the 4 bar range. If it is always high then you have an issue. My problem was that even idling the bar was at 2.5-3 bar and would go to 5 bar with ease when doing even light acceleration

My 996TT oil pressure reads right at the 4.0 mark at normal operating RPM's. Is that normal?
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rrspikemarty Member

rrspikemarty

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it might be as little of a problem as the oil pressure sender is bad. I would have them look at that first. They will need to hook up a manual guage to the car to see if there trully is something wron with your oil pressure or if it is the cheap oil pressure sender unit which is around a $80 part. I had the same issue with my 2003 c2. The oil pressure would consistently get to 5 bar at low RPM's and sometimes I would get an oil pressure failure to go along with it. I had the sender unit replaced and everything has been smooth sailing. I haven't had one other problem with the car. Overall it has been really reliable. Good luck but I bet it is nothing to really worry about.

I recently noticed something "possibly" odd about my 2003 911 C2. After the engine/oil is to normal operating temperature I noticed that oil pressure gauge is between 4 and 5 in six gear, about 2k rpm, around 65 MPH. I noticed that every so often I get a blip on the oil gauge. Essentially similar to a pulse or surge however not an extreme variation (maybe 1/4 mark up or down). I am wondering if this is normal or something to be concerned about as my CPO warranty runs out in 1 month.

Thanks for any advice.

Andrew

FYI - OEM oil sender unit for 2003 996 $42 + shipping from Sunset Imports. part 996 606 203 02

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Ahsai Member

Ahsai

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With key off oil pressure gauge should read zero. Turn the key on, engine off. Oil pressure gauge should still read zero. If gauge reads pressure, oil pressure sensor is faulty. Also check for loose / corroded sensor connections.

+1. That's what happened to my old sender. The new sender reads 0 whenever engine is off. But now 1.5yr later, it's reading 0.5 when engine is off...so it's on it's way out again :angry: Why German can't design better electronics???

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Falcon900EX Member

Falcon900EX

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My 02 996 just came out of the dealership for the 30000 check and the oil pressure is doing what everyone else is reporting. Off it reads zero, turn the key and mine jumps to 2. Put the engine under any load and it jumps to 5 and stays there. Is it a DIY job or does it need to go into the dealership again? Anyone know the shop time for that pressure sensor repair? :renntech: Thanks E

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Loren Member

Loren

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My 02 996 just came out of the dealership for the 30000 check and the oil pressure is doing what everyone else is reporting. Off it reads zero, turn the key and mine jumps to 2. Put the engine under any load and it jumps to 5 and stays there. Is it a DIY job or does it need to go into the dealership again? Anyone know the shop time for that pressure sensor repair? :renntech: Thanks E

Shop time is 30 minutes.

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rrspikemarty Member

rrspikemarty

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With key off oil pressure gauge should read zero. Turn the key on, engine off. Oil pressure gauge should still read zero. If gauge reads pressure, oil pressure sensor is faulty. Also check for loose / corroded sensor connections.

Experienced same erratic/random swings in pressure gauge reading as others have observed. Disconnected both leads from top of sender unit; cleaned both male connectors on sender unit; crimped female connectors with pliers; reconnected both leads. Problem seems to have gone away. I was a gnat's eyelash away from ordering a new sender unit. As someone else opined on this board, many many "broken" sender units are not. Mine was one.

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