Porsche Repair Questions? Ask a Mechanic for Answers ASAP
Hi Marcelo, this is Frank. I want to help you with your problem. I have worked at a Porsche dealer helping Porsche owners for over 30 years! So you have an 03 Cayenne S (V 8) and you are stating the PSM warning light fault is displayed after warning up? Can you give me more information please? Does this happen occasionally or does it happen every time you start the engine?
How long has the PSM warning light coming on?
Do you have the ability to scan the vehicle? Durametrics? I really need to know what the fault is in the control unit before we proceed. Those brake switches are super cheap and they did go bad often. If you do not have a scan tool, it would be the cheapest part to throw at it to see if it fixes it. Even lubricating them can not help when they are bad or worse intermittently bad!