Rough start then engine warning light

[mearnsmerc]

Last weekend when I started my 2002 W203 c180 est, it ran v roughly for 20 minutes before returning to normal - 1st time ever this has happened. Although, always from cold start the engine sounds louder than it should and outside the car smells a little bit of fuel. Although running and starting have returned to normal the engine warning light has been on all week. I have driven about 400 miles and the light has stayed on. Fuel consumption appears to be normal. Is it the MAF?

Grateful for any advice.

 

[jberks]

could well be. Best bet is always to get a diagnostic done as it takes the risk out of it but Iwouldn't be surprised if it was the MAF.

 

[television]

I do not think it is the MAF as this does not turn on the engine lamp but the O2 sensor will and this could upset the running as the mixture has changed

 

[mearnsmerc]

Thanks. Where roughly is the O2 sensor?

 

[television]

They are in the link

http://www.detali.ru/cat/oem_mb2.as...620716.633&CT=F&cat=65F&SID=49&SGR=180&SGN=01

 

[mearnsmerc]

Thanks Malcom. I 'll take a look in the morning.

 

[mearnsmerc]

After a further 2 weeks of perfect running, I got the fault code read. There had been a fault in cylinder 4. Think this might have been some dirt or something on the plug or in the fuel. I feel reassured by this. Should I be?

 

[television]

After a further 2 weeks of perfect running, I got the fault code read. There had been a fault in cylinder 4. Think this might have been some dirt or something on the plug or in the fuel. I feel reassured by this. Should I be?

Yes you should

 

[mearnsmerc]

Thanks Malcolm. I'm sure I'll find something else in soon to worry about on the car!