On 11/03/2021 14:58, Dave Plowman (News) wrote:
In article ,
tim... wrote:
mine just indicated it was a choice of sensors

the garage said, we can guess and if we guess right first time it will cost
you 80 quid

if we guess right last time, it will be 5-600

That is the problem. Mechanics now rely on being told what to replace -
rather than working it out themselves.

I once had a company car that snapped a cambelt and had to have the head
rebuilt. It was not running right afterwards - it was fine most of the
time, but would occasionally refuse to accelerate why you tried to
overtake someone.

I spent a couple of weeks driving with a data logger plugged into the
OBD2 port and then that was returned to the garage, who said they
couldn't work out the problem and they referred it on to Vauxhall.

Vauxhall looked at the data and diagnosed an engine bay wiring harness
problem, replacement cost £1200.

In the meantime the garage had closed down and the car had to go to
another one.

It went into the garage one morning, due to be there all day, but was
returned a couple of hours later. I queried how they'd done it so fast,
only to be told that one of their "old school" mechanics had had a look
at it and changed the ignition leads - it ran perfectly from then on!