Ive just got my car back from its diagnostic at a pug/cit specialist.

He told me there were a few problems. 1st ill quickly explain the symptoms.

Sluggish when turning over. Engine revs drop when braking until pedal is lifted. Engine 'over run' a few times when ignition is turned off (this is what set the management light off)

So there was a crank sensor fault. He then tested the battery and told me this was shot pulling only 200amps. He explained that this could cause that fault to show up.

The air flow sensor showed a fault. He told me this was also corroded.

Finally the fuel pressure regulator came up.

Now the car has covered 200,000 miles and if I could keep it on the road at a reasonable price I would.

However the only worry I have is that the cost of parts seems very expensive. He suggested £280ish for the fuel regulator and around £100+ for an airflow sensor.

The battery was bosch silver so was under its 5 year warranty.

My question is do I need to get parts from the dealer only as the mechanic doesnt trust aftermarket parts? If not where should I be looking to get them. I dont want to spend too much as I could get the codes cleared and the problem isnt solved.

Cheers