Hi Richard, there is no way to bypass the immobilizer but this sounds more like a bad K40 relay. When the relay fails you have no starter operation, no fuel pump and the fan runs on high. I'd substitute a known good K40 relay for this problem. The relay is located in the passenger side module box next to the battery under the bonnet. It's the relay with the fuses in the top of it. This is a very common problem on the SLK.
Hi Richard, your reply did not come through. Can you try again?
can you buy these and rough cost?
Yes you can, part number 210 540 00 72, Relay. Retail $192.
Let me know if you need anything else. I do strive for an "Excellent Service" rating. If you have any questions please don't hesitate to ask.
sorry got cut off . do you think it could be a bad connection?
The bad connection would be inside the relay itself.
A good electrician may be able to open the relay and resolder the circuit board.
ok thanks I will have a go