Hi all I am having a problem with my A class 170 diesel semi auto (T reg)
I turned off the engine today and noticed a buzzing noise from underneath the car. I thought maybe it was a fan and left it. Some 40 minutes later it was still there. Seems to be coming from underneath the car. as though something is stuck on. i have disconnected the battery until tomorrow to see if it goes away. what could it be.
I have noticed a smell of carbon monoxide in the car at times and now wonder if this is anything to do with it?


any ideas please?

 

OK then i can smell diesel fumes.