But sometimes they work as advertised. I borrowed a tool plugged it in to my GM
and got boatload of codes, one of which was "throttle stuck".
True enough the actuating pin was broken off. Fixing that cleared ALL codes.
Maybe there is logic to finding the furthest  "upstream" code?

The amazing part is that the car ran reasonably well, just using the other 
sensors
MAF O2 etc....

Dave

At 12:40 PM 10/19/04, you wrote:

> > Like any diagnostic tool, the result requires interpretation.  The
> > diagnostic codes are usefull, but as you have found, does not make
> > experienced engineers redundant.  Unfortunately many garages do not
> > understand this, and take diagnostic codes as gospel, replacing sensors
> > that
> > are operating perfectly well and charging the customer for their lack of
> > experience.
>
>I think it's less benign than that - yes, they allow themselves to become
>lazy, but they make money on parts, and use the tool as a way to fleece
>the customers. "The computer said the part was bad, so the part was bad".
>
>My motto is, if I can't fix it myself, I'll buy a new car. No garages for me.
>
>Cheerful regards,
>
>Bob

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