Oil Pressure Indicator Failure

[katyrow]

The oil pressure gauge on my 2002 C4 Cab intermittently drops like a rock to zero for between 5 and 15 seconds and then returns to normal. At the same time, the onboard computer shows "indicator failure." The gauge shows normal pressure at all other times (5 bar when the engine is cold, never below 2 at idle, etc.). Oil level is fine. Warranty expired in January of '06. This happened only once before the warranty expired. The dealer was unable to find anything wrong. Any thoughts on what this might be?

Thanks

2002

C4

Cab

Six Speed

US, midwest

[claudiu]

My guess is that the computer is right and it should still get repaired under warranty as the fault had first occured and had been witnessed by the garage staff when still in the warranty period...good luck!

[PorscheFan]

I had the same problem and dealer changed the oil pressure sensor under warranty. If you have reported the problem before the warranty expired, then dealer should take care of it.

[katyrow]

I had the same problem and dealer changed the oil pressure sensor under warranty. If you have reported the problem before the warranty expired, then dealer should take care of it.

Thank you for the responses. One more question on indicator failure messages. Am I correct that the "indicator failure" message is intended to convey a problem with the gauge or sensor, and that if my oil pressure was indeed dropping to zero and the gauge were accurately reflecting the zero reading I would not get the "indicator failure" message?

Thanks for your help.

[1999Porsche911]

I had the same problem and dealer changed the oil pressure sensor under warranty. If you have reported the problem before the warranty expired, then dealer should take care of it.

Thank you for the responses. One more question on indicator failure messages. Am I correct that the "indicator failure" message is intended to convey a problem with the gauge or sensor, and that if my oil pressure was indeed dropping to zero and the gauge were accurately reflecting the zero reading I would not get the "indicator failure" message?

Thanks for your help.

Extremely unlikely that your pressure ever fell to ZERO with the engine running. My be just a loose wire on the sending unit of a bad unit altogether. Unlikely that it is the gauge.

[dsnow]

I had the same problem and dealer changed the oil pressure sensor under warranty. If you have reported the problem before the warranty expired, then dealer should take care of it.

Thank you for the responses. One more question on indicator failure messages. Am I correct that the "indicator failure" message is intended to convey a problem with the gauge or sensor, and that if my oil pressure was indeed dropping to zero and the gauge were accurately reflecting the zero reading I would not get the "indicator failure" message?

Thanks for your help.

Extremely unlikely that your pressure ever fell to ZERO with the engine running. My be just a loose wire on the sending unit of a bad unit altogether. Unlikely that it is the gauge.

I have a 2002 C4s coupe manual and had the same problem. They said it was my guage cluster and they replaced it. That did not fix the problem and it turned out to be the sending unit on the engine. Yes the warning you are getting is just to let you know that something is wrong with the sensor or something else. If you lost pressure the idiot light on the dash would iluminate and that would mean you have a serious problem.

soutahc4s