Citroen Zantia lambda emissions failure

fix the exhaust leak , service it and it will be fine.

Sort the leak.

Exhaust leak is 99.9% causing the slightly off Lambda reading. Fix it.

Have it serviced. If she wants it reliable and wants to keep it running for some time yet, thats not an option.

Then bollock her for not servicing it again, not only for maintanance but from a safety point of view- brake pads and tyres being the most obvious.

Tim..

I read through some previous threads on emissions and combining that with your responses it all seems to make sense.

Thanks for the advice, Guys. I've told my friend to get the exhaust sorted and a service.

Well she took it back to the MOT people for a new exhaust. When she picked it up they charged her 20 quid cash for 'doing something' to fix it. Not exactly sure what they did, but it sounds like something along the lines of sticking engine cleaner fluid (?) in the air intake and running it through until the reading dropped the right side of the pass mark. Whatever it was they did, she has a printout which now shows 1.028, just a pass. She's happy and is now saving to get a new exhaust and a service a bit later in the year.