17-01-2014, 05:11 PM
Right guys..
Im totally out of my depth here, I have no clue when it comes to petrol emissions...and this is driving me insane!
One of my daily drives is a 1.6 ph2 306, 1998. so 1.6 8v TU motor...
Story is, last year (before my ownership) it struggled to pass MOT due to "Emission test struggle to pass CO level high" But it did pass obviously and got MOT. However it did have a new CAT and new (third party non genuine) lambda sensor sensor fitted...
Anyway, 2 weeks ago i fitted a new CAT (not genuine, one of the generic 80 quid ebay jobs) thinking that i could just bolt it to the car each MOT to let it pass)...but it seems that wasnt the cause, as its just failed the MOT on the same thing.. "Exhaust emmisions carbon monoxide content after 2nd fast idle excessive"
Question is...what can I do to make it pass / what is wrong... Here is the results...:
![[Image: IMG_20140117_150126.jpg]](https://lh3.googleusercontent.com/-TZ_YRPRGz9o/UtlF-3w37WI/AAAAAAAAReU/D_3JHb-jFRU/w740-h986-no/IMG_20140117_150126.jpg)
Only thing I can think of is swapping the generic lambda sensor for a brand new genuine bosch one....however when reading in pp2000, the mv output on the oxygen sensor goes up and down from 180-750mv..cycles every 1 second or so, pretty quickly...which im led to believe is normal as the ecu pulls / ups the fueling to maintain the correct mixture..so that would make me think its working ok ? Unless its reading wrong / holding the engine at the wrong mixture?
Open to any ideas as just need to MOT it, clean MOT other than this..the one thing i cant test, and really dont care for...
PETROL POAD!!!!
xx
Im totally out of my depth here, I have no clue when it comes to petrol emissions...and this is driving me insane!
One of my daily drives is a 1.6 ph2 306, 1998. so 1.6 8v TU motor...
Story is, last year (before my ownership) it struggled to pass MOT due to "Emission test struggle to pass CO level high" But it did pass obviously and got MOT. However it did have a new CAT and new (third party non genuine) lambda sensor sensor fitted...
Anyway, 2 weeks ago i fitted a new CAT (not genuine, one of the generic 80 quid ebay jobs) thinking that i could just bolt it to the car each MOT to let it pass)...but it seems that wasnt the cause, as its just failed the MOT on the same thing.. "Exhaust emmisions carbon monoxide content after 2nd fast idle excessive"
Question is...what can I do to make it pass / what is wrong... Here is the results...:
Only thing I can think of is swapping the generic lambda sensor for a brand new genuine bosch one....however when reading in pp2000, the mv output on the oxygen sensor goes up and down from 180-750mv..cycles every 1 second or so, pretty quickly...which im led to believe is normal as the ecu pulls / ups the fueling to maintain the correct mixture..so that would make me think its working ok ? Unless its reading wrong / holding the engine at the wrong mixture?
Open to any ideas as just need to MOT it, clean MOT other than this..the one thing i cant test, and really dont care for...
PETROL POAD!!!!
xx
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