lambda reading on a 96 nissan primera?

[chrisw]

My 96 primera just failed its mot on it emissions,lambda reading too high.What is the lambda reading?how can i lower it?By the way the car doesnt idle very well when its warm,low erratic revs and cuts out,anybody have any ideas?

[Tricky]

My car failed MOT last week on the same thing.
All these was fine aprt from that same point on the emissions test.So i was told to buy a universal sensor of these guys and now car runs like new,and passed retest no problem.

https://conceptua-tuning.co.uk/product_display.php?pfc=661c640a097d0d453c7d8b1590 1caaf9&product=146&cat=24

Worst case the cat is no good but try above first as def the cheaper option.