Vauxhall Zafira B - Vauxhall Zafira co2 emissions fail - Johno23

I have a 1.6 litre petrol Vauxhall Zafira. I recently put it in for it's MOT and it's failed on two minor things and then co2 emissions. I tried additive and a good thrashing and put it for retest it still failed. So I tried an oil change and oil filter gave it a run again and it still failed. So put it for diagnostics which the garage said came back clear so they were sure it was the cat. So i had a new cat put in and downpipe at the garages recommendation but had my brother in law do it independently who is a qualified mechanic. When I took it for a retest however it still failed on co2. Garage who did the diagnostics say it's because the cat was bought from a cheap supplier (Euro car parts). Does anyone have any idea where I go now? Don't wanna pay for the cat to be replaced again. Surely even poor quality parts couldn't be sold unless they pass? Is the garage fobbing me off as they assured the cat change would fix it? Any help would be greatly appreciated. (Also in terms of emmissions MOT test centre said it shoots up to 2% then after running drops to 0.34% then fluctuates up and down from there, but never lower then the 0.2% needed.)

Thanks John.

Vauxhall Zafira B - Vauxhall Zafira co2 emissions fail - elekie&a/c doctor

Do you have a copy of the the emissions test results?Should be provided by the test station along with the fail sheet.

Vauxhall Zafira B - Vauxhall Zafira co2 emissions fail - Johno23

Hi there yes I do sorry for slow reply have been away the weekend. They are currently in the car so I'll take a pic and load them up in a little bit.

Vauxhall Zafira B - Vauxhall Zafira co2 emissions fail - Balboa

Hi I have had a similar problem with my zafira b 08 1.6 z16xep. I'm currently in the process of rebuilding the engine. Pretty much everything else was ruled out. Oil change oil filter. Cat converter. o2 sensor. Spark plugs. Coil pack. It was established oil was leaking into cylinder causing a dirty burn hence the high emissions.

I am in the middle of rebuilding the cylinder head. The only thing I have found so far which was wrong is a removable panel on the inlet side below the intake ports of the cylinder head. I found this to have a channel to each port and a main channel connecting to the egr. The channels to each inlet port were entirely blocked with carbon build up and therefore could not function as designed.

 

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