Have had to replace the lamba sensor on 3 occassions to date on my 4 yr old octavia rs {30,000} miles on the clock .Anyone have any idea whas causing this ,ty in advance

Is this one of the cars with a high oil consumption, or are you using cheap pattern parts, cos those are the only 2 things I can think of that could kill llambda sensors that quick.

Or it could be overfuelling

Try doing a reading of the MAF to see what it is reading

Overfuelling is not good so get it checked out

Sarah

Not sure about that; isn't over-fuelling a potential result of a duff lambda sensor?

MAF detects how much air is going through and adjusts the fuelling to suit

Sarah

As does a lambda, which is why you need (a working) one to achieve stoechemetric mixture.

In fact the real issue with a duff lambda is that it's quite likely to kill the cat!

We have had LOADS of cars in that read there is a problem with the lambda , when in fact it is the MAF

Sarah

Ok.