O2 sensor

[fendervg 33]

Just wondering if anyone knows how to tell if an O2 sensor needs replacing? How long are they supposed to last?

 

Thanks.

[Sean_Jaymo 0]

Vcds logging will tell you.

[fendervg 33]

Ok - nothing wrong with mine so. What about the MAF?

[swiftkid 1]

In my experience lambdas very rarely go wrong with the vr6, maf's on the other hand go all the time and they make lambdas throw up a code. I'd always check the maf us working before looking at the lambda sensor

[fendervg 33]

Ok - thanks. What's the best way of testing the MAF?

[Sean_Jaymo 0]

Unplug it with the engine running, if it's OK the engine will run like a bag of nails. If no change, then it's likely dead. What are your symptoms?

[fendervg 33]

Power is down and sometimes it stalls when coming to a stop, and hunting idle as well intermittently.

[swiftkid 1]

Sounds suspiciously like maf to me, those things are sneaky little gits! Try to put the blame on lambdas!

[Sean_Jaymo 0]

I agree with SwiftKid. They are obsolete now but this thread comes up a dozen or so times a month. Have a quick look back through the recent threads and you'll find the answer on how somebody solved their problems...

[fendervg 33]

Cheer for that - I have an old MAF that I will swap in and test and see what the results are. At the moment there is practically no difference in engine behaviour when the MAF is unplugged.

[Sean_Jaymo 0]

You can clean them up with electrical contact cleaner for potential short term fix.