996 turbo rear spoiler warning light

Hello, I have this waining coming randomly every time the rear wing comes up (120 kmh) but it works fine, when I switch the car off/on the message disappears , what could it be? Marcelo

Does it go up and down on the manual dash switch?

Yes, it does normally.

Tiny micro switches detect correct operation. Check the wiring to these it is quite fragile

Hi. Same thing happened on mine. It was a failed spolier mechanism/motor. Mine was just inside its warranty otherwise it would have been a £1000 bill :sad:

Plenty of informations on Rennlist.com about that common problem on 996tt. Very expensive to replace the system. Few ways to fix them. A kit is available to keep the wing up all the time. ( the all mecanism will be remove). Normaly switch playing up or hydraulic seal braking up. It is important to keep the 2 stainless shafts clean all the time

Any fluid leaks?

No leaks, I move the wires around and test many time and it worked fine, but lets see for how long

I wrote this a while back for another forum. It is quite long winded but may give you a clue to what is happening. Hope it helps. For those with a turbo, here is some information about the spoiler warning light to help self diagnosis if you don't have Durametric/PIWIS or PST2 if it comes/stays on. The ECU does a self check everytime the car is started and if there is a fault in the system the light will stay on. If it goes out but comes on later when the spolier is supposed to rise at 75 mph but doesn't then it is a fault with the pump/rams or lower microswitch. If it rises normally but then the light comes on as it hits the bottom stop then it may be the upper microswitch that is faulty. The lower microswitch is a NO (normally open) switch i.e the circuit is open until the switch is pressed then the circuit is closed. The upper switch is NC (normally closed) so the circuit is closed until the switch is pressed and it opens the circuit. Normally when the rams are down, the bottom microswitch is closed and upper one is open (as the ram is pressing on both microswitches) . As the ram rises, it is no longer pressing on the lower microswitch so its open but the rams is still pushing on the upper microswitch so its open too. There is a situation when both are open until the ram hits the top then the upper microswitch is now closed (as the ram is no longer pushing on it) and the bottom one stays open. So its either one or both open at any one time normally. The spoiler warning light will come on if both micrositiches are closed at any one time. If the light comes on as the ram hits the bottom stop and doesn't come on if the car is started with the spoiler up, both switches must be closed when the rams were at the retracted position i.e the upper switch was not clicking to open the circuit therefore its the upper switch that is faulty. If there is no warning light but the spoiler fails to rise then both the lower and upper microswitch must be faulty as the faulty lower microswitch must register as open and the faulty upper one must register as closed so the ECU thinks the spoiler is up. In my car the spoiler had been playing up for a while then it only rose one side after that and it turned out to be the pump that failed. I opened up the pump and a plastic bit had broken. The faulty microswitches must have precipitated the problem as the microswitches tell the ECU when the spoiler is up or down and instructs the pump to stop working when the limits are reached. Failing microswitches don't so the pump keeps trying to turn and the stress on it broke the only plastic bit in it requiring a new pump and lines at a cost of £1000 + vat. It all sounds a bit confusing above but hopefully it'll help someone whose warning light has come on and wants to try to self diagnose the problem.

Thanks guys I have tried now with the wd40 and still it fails. It fails only when the spoiler goes up, so I believe that it is the upper microswitch, is there anywhere instructions of how to dismount it? M

The microswitches are attached to a carrier on the right ram. Unclip the 10cm cover on the back of the ram by pulling it perpendicular to the ram. You will now see the carrier with the 2 microswitches. 3 screws hold it to the ram. Undo the screws and you can move the carrier from the ram. To change the upper microswitch, push it out from the carrier carefully (it is tight and mine broke as I removed it) and then cut the wire at the microswitch and join the wire from the new microswitch to the one you just cut from the old microswitch and solder it. Use heat shrink tape to secure the join. Refitting is the reversal of removal. Cutting the wires and soldering the new microswitch in is the official Porsche way of replacing the faulty one. Someone with a PIWIS can look for fault codes to indicate if it is the upper switch is faulty.

Hello I remove the switches and I think the upper switch is not ok, I can clear see that the previous owner has been there. Where can I buy a new set of microswitches? Marcelo

Porsche or Design 911

Hi, microswitch part number is 99661317100 £31.79 plus vat. It has a note next to part number to order the housing 99651291800 £13.46 plus vat not sure if needed or not as may be modified?

I replaced mine without changing the housing. The part number from my old one was the same as the new one.