mattbowden

I also had the problem of the lambda light coming on, with the associated 'camshaft position sensor' fault code on the underbonnet diagnostic box. The difference with mine was that the engine would cut out when it happened. A couple of events on the M3 had me thinking that my end had come as the engine died in the middle lane with large lorries all around me.

After much discussion with experts I finally sourced the problem myself.

The rubber gasket in the oil filler cap had hardened, and wasn't sealing any more. Oil was leaking out the filler, running down the side of the ignition coil cover, and dripping onto the electrical connection block where the camshaft sensor plugs into the loom, causing a temporary short.

A quick clean out with contact cleaner, and a new rubber gasket, and the problem's gone.

Out of interest I also have a 940, which is Volvo serviced. They replaced the rubber gasket on the oil filler gap at the last service, without me asking. When I asked why, they wouldn't admit to any problems, but just said that it was a 'wise thing to do'.

Matt