My 2005 Focus with 85k miles had a problem with the sensor in the throttle body giving bad readings, causing it to drop into slooooooow mode. Ended up taking it to a garage where they got the read out codes, and after talking to me for a little while and I paid for the diagnosis (they said a lot of people would try and leave without paying) the mechanic decided to try and clean it out for me.
He said there was a lot of build up in there which he'd got rid of, and the last few months it's been perfect again, However today the error seemingly reoccurred. I managed to pull over immediately, stopped and restarted the car (and the error was gone -- this is the same as was happening before) -- out of gear I gave it a good revving to hopefully clear some of the gunk out (No idea if this would work but I figured it was worth a try) and after that it drove perfectly again.
As this happened before it was about 3 months from the first occurance, to it completely getting stuck in speed limiting mode, I'm concidering trying to clean the throttle body myself, however I'm no kind of mechanic, just a guy who understands how things go together.
- Is it worth me even trying this as a beginner, or should I just take it to the garage again?
- Is it worth seeking out a replacement sensor? From what the mechanic said at the time sometimes changing the sensor can work, but they'd generally just swap the whole throttle body out at first thing however he did admit to not having done it on a focus before, only other cars.