Originally Posted by
Ellie
Thought i did.
Its running heavy on petrol and hesitates and judders when you out your foot down quickly, overtaking for example. Itll pull through it eventually.
Other than that runs sweet.
whats happens if the maf totally fails?
If totally fails the CEL light will come on and car go into limp mode which should be relatively safe.
As it's failing, with no warning the car can run lean under load which will result in a blown engine.
Wouldnt say it would generally make it heavy on petrol though.
A malfunctioning lambda sensor would generally cause high fuel consumption, but will have no impact on performance under load. Idle, part throttle maybe, but not full load.
And again, this will not throw a fault code.
If the car has never had a MAF or you dont know it's history, you would be doing no wrong by replacing it.