MOT Failure on Emissions...Having searched...

[scruffty]

Hello
My Reborn Cup, sigh, failed its MOT on rear brakes (lol) and emissions.
CO 7.98%
HC 326ppm
Lamda 0.784
CO 9.67
HC 403ppm
Lambda 0.739
The garage is adamant that it needs a new cat at £350+ (don't worry, i have seen them on ebay for £115)
Doing a few searches on here looks like lambda sensor for the pre cat have sorted the issue. I can get one from Eurocarparts for £61 and someone can fit it for £30.
But, something occurred to me, recently I did have a misfire which was cured with a set of new injectors (and plugs)...could a missfire damaged the cat and cause it to fail the mot? or do the garage want my ££££? Obviously I know you guys don't have a crystal ball but I'd be appreciative of any advice.
(no EML btw - it used to flick on and off again with the miss, but that is cured now)
Thanks!

 

[bloke]

christ that must stink!!! bung a lambda on it and see how it goes. had one running 10% but flew through with new lambda on.

 

[scruffty]

lol it smells lovely. although not affecting mpg as it still high around 37 with operation stack on every 5 minutes!!!

 

[Dan@SJM]

General rule of thumb, below 0.7 and still a fail is cat, 0.7-10% is lambda.

 

[Amos91]

Mine was very similar. Lambda fixed it and brought the emissions down massively.

 

[scruffty]

cheers, have a new lambda and will be fitting it next week, fingers crossed!!!!!!

 

[scruffty]

thanks all, got another 12 months

 

[Bear Head]

Cheapest option is to take it somewhere that doesn't care XD