Evening all. Apologies for my first post being a bit bloggy and long winded.... A week or so ago I bought a very nice looking 2001 CLK 200 with 93k on the clock. Despite the fact that it was advertised on a dealers website, the salesman was insistant that he was selling it for a friend and as such he deemed it as a private sale. I was initially a bit put off by this but the car was good value - £2900 so I went ahead with the deal. After owning the car for half an hour, I noticed a slight juddering at idle/park. After another half an hour the engine warning light came on and I therefore phoned the dealer straight away. In fairness, he told me to bring the car back and his electrical man ran a diagnostic which told us that the oxygen sensors weren't giving any readings at all. I then had to take the car back again to have two new O2 sensors fitted. After further inspection, it turns out that the O2 sensors were quite new and working properly so I didn't need the new ones after all. The electrical man then suggested a new air mass sensor would solve the problem and the dealer has sent me a new one by post for me to have fitted at my convenience - rather than having to do a 1.5hr round trip/£20 in petrol each time back to the dealer. Does anyone think this will solve the problem? Anyone else had similar issues? I'm at my wits end with the car now, I really like it but the constant orange glow of the engine warning light is getting me down and I'm worried it will eventually slip into "limp home" mode! Any help or advice greatfully received.