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Edited 29 May, 201115 yr by Feely

Does it seem to reset itself if you turn the engine off for a minute or two and then start the car again? Especially if you can't go above 3000rpm?

My guess is that the car is going in to limp home mode caused by an intermittent fault.

Given that the MAF has been replaced, I would get it to a VAG specialist that can read the fault codes with VCDS.

I had a similar experience of the not going above 3000rpm, it was an intermittent overboost condition caused by sticking vanes in the turbo causing the ecu to go into limp home mode.

Does it seem to reset itself if you turn the engine off for a minute or two and then start the car again? Especially if you can't go above 3000rpm?

My guess is that the car is going in to limp home mode caused by an intermittent fault.

Given that the MAF has been replaced, I would get it to a VAG specialist that can read the fault codes with VCDS.

I had a similar experience of the not going above 3000rpm, it was an intermittent overboost condition caused by sticking vanes in the turbo causing the ecu to go into limp home mode.

When the car has been going particularly slow, I had read that it may be help to turn the engine off/on to reset it, so I have tried this several times. However it did not work every time.

I believe that even though I have regularly experienced a lack of power, only once could I have described it as 'limp home mode'. When this happened I could hardly get going at all and was stuck in the slow lane of the motorway.

The mechanic read the fault codes and assured me the most likely fault would be the MAF, however it now appears he was wrong.

I do not know the error code he got, but I would assume a code for a dirty/faulty MAF would differ to that for the stinking vanes problem you mentioned?

It would, but it depends what they are using to read the codes.

VCDS would be the best thing as the ECU logs details about intermittent faults.

I wasn't suggesting you necessarily had the same fault as me, I had no rough running at all, it just dropped in to limp home when flooring it off of a roundabout. Pulled over and restarted and all fine for 2 weeks when it did it again.

It sounds like you have something intermittently faulty that is occasionally triggering limp home mode.

I wasn't suggesting you necessarily had the same fault as me, I had no rough running at all, it just dropped in to limp home when flooring it off of a roundabout. Pulled over and restarted and all fine for 2 weeks when it did it again.

That is exactly what happened to my 1.9TDi - floored it off a roundabout and it wouldn't rev over about 3000rpm. No warning lights, perfectly smooth and rolled along quite happily at 50-60mph but no acceleration.

Before it happened I was half thinking of a change anyway - that was enough excuse to tip the balance .

The maf may well have been part of the problem & the mechanic has done the right thing by starting with the cheapest option & it sounds as though it has improved things

Odds are it may well be the turbo as its a very common problem & will slowly start to happen more & more frequently. The only thing that dosent run true is that if its the turbo switching the car off & restarting it in my experience always clears the fault & you say it hasnt always done so, if that has always worked since the maf was changed then its pointing towards the turbo but as with all things "internet" diagnosis is a random art, a good mechanic you trust is far better.

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Edited 29 May, 201115 yr by Feely

Have a look here for an explanation, may just be loose wire ?

http://wiki.ross-tech.com/wiki/index.php/16622/P0238/000568

Had same problem - replacement of N75 valve cured things.