Replaced MAF, still errors.....

[sparker]

As for AOS, there is no oil over motor - I will check throttle body again but I believe it to be ok. As for the sound with the oil cap off, yes, there is noise but I would expect there to be. The car won't idle with this off though - can someone please confirm if this is a good or bad sign?

Thanks guys,
Sam

[jhandy]

yes that is normal to not run smoothly with the oil cap off. That is why when the oil fill tube leaks, the car will run like crap, but looks normal.
If you are not using excessive oil or leaking oil into the throttlebody or as a mist covering the motor the aos sounds fine. There realy is not way of telling for sure if it is getting weaker. it is usally a failed-or not failed thing. Thats why it is advised to replace it as maintance every few years.