I recenently had my 2002 Focus to the garage as the engine management light was on
They did a Diagnostic check and came up with the Lambda sensor was at fault which they replaced.
They then said it was still miss firing and after checking plugs etc they came up with the Mass air sensor was required as they said it ran OK when it was unplugged.
I ran with it unplugged and it was a hell of a lot worse than when I had taken it in so I pugged it back in and it then ran a lot better Not perfect but better, and the management light was still on.
So I think I might change the MAS myself as I feel the garage were charging over the top
and if I can get the part number I can get a MAS from our car dismantlers
DUMB QUESTION where can I get the part number from ???
