ABS light.

hothatch2002 · Jul 13, 2005

If I drive the car at a nice steady pace evreryhting is ok, but if I floor it and give it some revs the ABS and PSM lights come on, and it feels like it lost about 50BHP. If you stop and restart the engine does exactly the same thing, and once again when you boot it, the light comes on, seems to mainly do it when the engine is hot. I have rang the dealer and he said that it is probably the air mass meter which is faulty, so the car uses other systems to run the engine (i.e. the ABS) I know how air mass meters and ABS systems work, and for the life of me can't imagine how this is true. Am I wrong or is the dealer talking rubbish. Anyone else had anything similar??

Simon (98 C4 manual) Thank God I bought the extended warranty!!

gaxor · Jul 13, 2005

Your OPC guy is probably correct. I had a turbo hose detatch istelf and the ABS light came on. Also any air leak in the system will have the same effect.

Guest · Jul 13, 2005

Have same problem at the moment and still trying to resolve......ABS and PSM lights come on around 3-3500 rpm, about the same time as what feels like a slight misfire occurs.New air mass fitted but not solved problem, so car back in next week, will keep you posted.

99 C4 Cab.

hothatch2002 · Jul 14, 2005

Hi Richard, looks like we have exactly the same problem. I couldn't get my car booked in until 27th July, but I go on holiday on the 29th for 2 weeks, so won't know if it is repaired until a get to give it a good thrashing when I return on the 14th. Can you keep me posted with any information that you find out before the 27th so I can annoy the dealer!
Cheers
Simon

Guest · Jul 14, 2005

Hi Simon, will let you know the conclusion as soon as poss.Meanwhile any comments from readers, as to other items worth checking, would be welcome.
Richard.

Guest · Aug 7, 2005

Simon, sorry for the delay in getting back to you on the ABS/PSM warning lights and misfire problems on mine, but they took a little longer than expected to eliminate...we hope.

Latest situation, after changing and testing a few things including air mass sensor, is that following a change of throttle body and brake light switch, things feel okay across rev range and no warning lights have appeared.

JAZ in wembley were excellent .... they asked to keep the car for as long as necessary to test/fit things, test drive, let engine cool down, start again etc etc. Following that, I've now used the car for a week including a blast to the Lake District and back, and so far so good.The final bill reflected only the work done to replace the offending parts and not the additional time & effort eliminating other options .... refreshing approach to problem solving in my experience.

Hope this helps.

Richard
99Cab4man

philippe · Aug 8, 2005

It's funny because i have had these warning lights come on as well, but it only seams to happen very occasionly and when the car gets very hot, sitting in traffic. The lights stay on until the engine is switched off and there does not seam to be any kind of power loss or misfire. I went to my OPC and nothing was showing on the system has not done it for maybe 500 if not more miles now?

Phil

carrera4boy · Aug 8, 2005

Richard,

How much did it cost to rectify the problem. Mine is mis-firing and even back-fired yesterday. But lights don't show there is a problem.

Simon 2000 996 C4

Guest · Aug 8, 2005

Simon,
£319 (inc).
Richard.

Grant · Aug 9, 2005

HOTHATCH: Just as a matter of interest have you got an aftermarket air filter fitted???

hothatch2002 · Aug 15, 2005

Just got back from a nice 2 week break in Corfu, the car was ready on the morning that I went on my hols so collected it and put it straight in the garage at home. Gave it a damn good thrasing today all seems fine now.

Anyway, on a rather more interesting point I asked one of the engineers to sit in with me while I drove down the road to listen to a gearbox noise which was whinning but only very slightly, and also a type of resonance noise (it's not easy to explain). After about 1 minute he said, the pinions were knackered and it needed a new gearbox at £5500!! Luckily my extended warranty picked up the bill - and guess what ....................... wait for it.......................... the car still make the same weird noise, hopefully they will keep replacing stuff until the whole car is new. I'm going to put another post on for this topic because this is the edited version.

Guest · Aug 23, 2005

All,
I also had this problem on a C4 and it took my OPC so long to track the problem down that I ended up getting my money back - all of which is documented in a previous thread - the dealer replaced lots of things such as wheel sensors, air mass sensor, ABS pump matrix etc etc and told me that in the end the thing that sorted it was when they put a new brake light switch in!!! - I wonder whether the problem is only common to C4s or whether any C2s with PSM have also had this fault?
Regards
Dave