PSM, ABS, But No CEL's???
 

Out driving my car this morning, and it just cut out a couple of times then died. PSM and ABS lights were on, but no CEL. I turned the key off and back on and it started up. This happened several times and it restarted every time. Well I was headed home, and it just died and wouldn't restart. Called Porsche, and got a tow truck on the way, and while I was waiting I tried to start it again and it worked. It died a couple more times on the way home, but I got it here. I just hooked my scanner up and it said there were no codes at all. Could this be a MAF, or would I also have CEL's? :confused:

I would agree, I bet its the MAF.

Even without a CEL? I thought for sure it would throw a code, but I'd love to be wrong.

possibly fuel pump...have fuel line clamps checked.

Doubt it is the MAF that caused it!

It would be nice if you could scan for a code the next time the light comes on - before you turn off the key. There is a tech bulletin on fuel pump hoses coming loose in the gas tank. Could also be something simple like a clogged fuel filter. Since many gas stations in DFW ran low on gas you might have gotten some crud from the bottom of a gas station's tank. Did you buy gas since last Thursday?

Chipped or not?

I did buy gas, and it is chipped. If it had a code, the CEL would be on, correct? Wouldn't have also been saved in the memory?

did you fix the problem? and if so what was it?

Thanks

it was MAF problem, mine have the same PSM and ABS light before. Replace new MAF will fix the problem

I would bet there is a pending code and it is not the MAF. Go have the pendings pulled by a PST2 and see what they say. I suspect something other than MAF here.

I believe Big Carrot has the Upsolute programing and has problems with cold weather. Stephen I know you worked on a few of these programed cars. What`s up? Is it related to Upsolute?

What could it be? when I unplugged the MAF wire the car idled perfect and totally drivable to the dealer.

When you unplug the MAF, the car will fall back to a "safety" mapping (usually runs a little rich to be on the safe side) table that was already programmed into the car's ECU. It uses an pre-programmed educated guess for airflows at various RPMS, so to speak, in order to let you get the car back to the dealer.

so if the car runs smooth on the safty mode then there shouldn't be a major problem right? and MAF could be failed.