Hi guys/gals,

My recently purchased Audi A4 2001 (newer shape) has gone into 'limp home mode' 3 times in a month. Twice this occured when it was pouring with rain, and once it occured as I pulled out of a car wash.

The symptoms are that the cars falls to 1200 revs only, the ESP light comes on and the Glow Plug light lights intermittently.

The first time it happened I took it to a Audi specialist garage who diagnosed the accelerator switch was faulty. It was replaced and all was well until I went in the car wash. This time I limped home and was advised by my bro to disconnect the battery and leave off overnight. When I reconnected the battery the fault had cleared and all was well. I had it checked out and nothing was found.Last week I was driving in the rain and it happened again! I disconnected the battery for 3 hours, and again the fault cleared.

I have now given it to an official Audi garage. They have changed the accelerator switch again, but they also found a fault in the steering rack.

I'm not convinced the fault is fixed permanently. I'm presuming the fault is water related, but wouldn't know where to start.

Any ideas greatly appreciated?