HRHighstone

Very recent new and first time owner of a 2004 996 TT w 27k miles. After spending some time troubleshooting simultaneous PSM/ABS warning lights along with a subsequent Check Engine Light, my service tech determined that the Gas Pedal Position Sensor (potentiometer) is bad and needs to be replaced.

So my question at this point is whether to spend approx $1300 for a new one from a reputable parts provider in Atlanta as the service manager is recommending, or assume the risk and spend only $50 for a used one off eBay and have them install that one.

It is a big expense but I don’t want to take any chances that may have adverse consequences related to safety or vehicle mechanical and electrical integrity.

Thanks in advance for any thoughts and views on this question!

theprf

I would risk the $50 on a used one. Even if a shop is doing the install it should not be more than 1 hour of labor.

HRHighstone

Thanks for taking the time to reply... not being sarcastic as the economics are obvious but was only concerned about vehicle and safety integrity. Especially since Porsche changed the part number for that potentiometer (...000 to ...002)

geetee

Hopefully they diagnosed it correctly..... psm/abs with check engine light is a very very common sequence for many different "issues". That part does not go bad that easily but you never know.
You can get that part for under 1k porsche brand. Also, that part is a bosch part and if you can get the bosch part number, it'll be the same exact part for about 1/4 of the price.
It is a pain to get to that part as you have to be on your back in a tight space but I'd say 1h labor. I'd risk it and get a used one and if it solves the problem....guess you can always get an OEM one.
I actually bought a used one years ago when I had psm/abs with check engine code indicating potentiometer. Turned out to be sprint booster that went bad after a few years of usage...

TexSquirrel

I’d buy one off eBay.
Heck, you could buy 2 of them just in case you got a bad one.
It is a PIA to replace, but I’d risk doing it twice.
I don’t believe there is a safety risk in going used.

theprf

By the way, the warning light trifecta is almost certainly not the gas pedal sensor. Anyway with a scan tool like the Durametric the gas pedal sensor can be checked in about 1 minute.
The most likely cause of the CEL/PSM/ABS light trifecta seems to be a bad MAF - why this screws up the ABS is anyone's guess. Probably because of random misfires and the DME's anti-engine stall logic.
I'm dealing with this right now, too, except mine is very intermittent and I have another random engine issue going on as well.