Lads maybe Johnny99 or Davelegacy could explain this one better
but i have often in the past got a diagnostic done on the car , showing no faults,
yet the car was running poor due to a O2 sensor that needed to be changed or a MAF that was
starting to go .
Maybe this is an isolated prob ...... but i reckon the diagnostic will only show a fault if the
sensor is broken and not if it's on the way out ????????
Niall.