i20 Lambda sensor

[233sqn]

Hello all

Working on my son's 2011 i20 1.2 and noticed the Lambda reading has been creeping up on successive MOTs, and it only just crept in last year.

I'm assuming that after doing plugs, air filter etc and checking for leaks, next thing is Lambda sensor?

Any ideas how many, where they are (ie how do you get at them) and are they difficult to change?

Just wish I could get a good old Haynes Manual for this car!

 

[Burnerman]

There are likely to be two lambda sensors on the car - one immediately before the catalytic converter and one after it. It is possible to monitor their performance (as a rule and to some degree) using the correct diagnostic equipment.
They screw in and come with their own length of wiring loom....sometimes they are ferociously tight!
Unfortunately there is no guarantee that new sensors will cure the issue, it could be the cat getting a bit past it too.
I have to recommend dealer parts for these items, having been caught out in the past with dud after market gear.
Before submitting for the MOT, get the exhaust system melt down hot!
John