Oh yes,
A Renault garage tried to charge me £120 for a replacement oxygen sensor (part and labour) after charging me £40 to run the diagnostics program (bloody rip-off in itself for what they do).
Instead I bought the part from them for a tenner and fixed myself within half an hour in their car park. It took me a little while as it was a bit difficult to find.
As I gave the mechanic a cheery wave on the way out I could swear he was willing the car to explode under his death stare.
( VandenPlas can't think of anything clever - no change there!, Sun 30 May 2010, 13:59, 1 reply)

Doing the same...
... sourced part for 25 quid. Will fit myself - it's literally a couple of plugs and some screws. Then putting the dashboard back on - but I haz Haynes so I don't feel too blue about that.

Then get the alternator that the fault that the electro-fucks couldn't find blew up and probably get my local banger-doctor to fiddle with the various belts that this would need to fit.
(nordelius, Tue 1 Jun 2010, 13:30, closed)