oil pressure sending unit failure, again

[int90]

A couple of months ago, the oil pressure gauge dropped to 0 for a second or 2 and then jumped back up to normal. Happened a few times within 10-15 minutes.

I replaced the sending unit with a new one (part number ends in 02, revised part?), and now after a few hundred miles, the problem is back. I also noticed sometimes the gauge fluctuates when there's no change in rpm. I just checked the connectors on the old unit and there's no corrosion.

Any suggestions? Should I just try another new sending unit?

The car is a 03 with 19K miles.

Thanks.

[Sunnyside]

A couple of months ago, the oil pressure gauge dropped to 0 for a second or 2 and then jumped back up to normal. Happened a few times within 10-15 minutes.

I replaced the sending unit with a new one (part number ends in 02, revised part?), and now after a few hundred miles, the problem is back. I also noticed sometimes the gauge fluctuates when there's no change in rpm. I just checked the connectors on the old unit and there's no corrosion.

Any suggestions? Should I just try another new sending unit?

The car is a 03 with 19K miles.

Thanks.

I take it the oil pressure light does not come on?

It must be a common problem with our cars, my sender unit was changed under warranty for the same fault as yours.

If you can get the car on a ramp, get some one to sit in the car and check the gauge whilst you go and have a good tug and pull of as much of the wires and harness near the sender as you can.

If not see if there are any dash fault codes. Do you have access to a Durametric.

Sounds like a dodgy connection. The thing is, Porsche changed mine. moral dilema it was just a simple connection, would they say so or charge the warranty company for a new unit and Labour?(It might not be the sender unit).

Keep us all informed.

Frank.

[deepblue5280]

I had the same issue, I had some maintenance done at the same time, replaced the sending unit, problem persisted, ended up being the wiring not too far from the sender.

A couple of months ago, the oil pressure gauge dropped to 0 for a second or 2 and then jumped back up to normal. Happened a few times within 10-15 minutes.

I replaced the sending unit with a new one (part number ends in 02, revised part?), and now after a few hundred miles, the problem is back. I also noticed sometimes the gauge fluctuates when there's no change in rpm. I just checked the connectors on the old unit and there's no corrosion.

Any suggestions? Should I just try another new sending unit?

The car is a 03 with 19K miles.

Thanks.

[int90]

Thank you Sunnside and Deepblue for pointing out the problem being connections/wiring. My tech reported the connectors seemed a little loose and appeared to have some heat damage. I chose the quick and cheap fix - tighten the connectors (0.75 hrs of labor) instead of replacing them (3-4 hrs) . I'm happy to report after about 200 miles, including a track day at Laguna Seca, the problem has not returned.

[swan00]

Could someone tell me where the oil pressure sender is on a '01 996tt?

[jpflip]

Just forward of the oil filter housing...

Edited April 19, 2013 by jpflip

[swan00]

[*]Thanks for the picture.

[04TurboCab]

Indeed, thanks for the pic, jpflip! I have had the same problem, but only sporadically, and it seems to have vanished as of late.

[jpflip]

Welcome. It is also good to know there is a new part#, probably an improved. Part# was 99660620300 and it is now 99660620302. Never had any problem since I've installed the new model....