I had 2 faults just after getting he Plus8....2002 car.
Random intermittent misfire
Evap fault.
Maxiscan diagnosed and removed them.
They occasionally came back.
I used Shell V-Power for a few tanks and they have never returned. I now use it every other/3rd tankfull. I sense the engine runs better but nothing spectacular. I also put short lengths of heat shield around the plug lead ends as they sit very close between exhaust manifold sections. Plugs were new, Magnicor leads all fitting properly.
As for the Lambda sensors, The car has a history of being on the limits at MOT. No fails, just very close. I make sure the car is at a good temp before the MOT....a couple of nice roads nearby to get the heat up
