Having bought our first Scooby some 6 months ago it was time for its MOT this week. It failed on the emissions and a lower ball joint. I have replaced the ball joint and was advised to try a fuel additive to get the emissions down. Took it back after running the additive through and going for a good long thrash to work it in. Well the readings are still high help. Readings as below.

Fast idle test
CO Max 0.30% 0.61% Fail
HC Max 200ppm 29ppm Pass
Lambda 0.97-1.03 1.01 Pass


Second fast idle test
CO Max 0.30% 0.83% Fail
HC Max 200ppm 63ppm Pass
Lambda 0.97-1.03 1.02 Pass

Natural idle test
CO Max 0.50% 0.76% Fail

Can anytone help could this be the sensor or has the cat had it ? I have a few days left for the re test to sort or its another full test.

The Scooby is a 2000 UK turbo it came fitted with a full 3 inch stainless exhaust which I am having problems finding out the make.

 

Dumb question maybe, but seeing as it has an after market exhaust, are you sure it does actually have a cat fitted?
Sometimes the obvious things escape us.

 

I did question this with the MOT garage he thinks it does. It would help if I knew the make of the exhaust though.

 

If its a full 3" exhaust then if it does have a cat, it'll be a sports cat - some of which have been know to fail, the emissions.

A solution is to find a fellow scooby member from your local club which may have a catted centre section that you could borrow, its a 15 min job to swap over, get it nice and warm before the retest.

 

CO level at lambda1 with no cat should be circa 0.67% so you either have no cat or a FUBAR one!

Simon

 

Thanks for your all your help, have taken to a local Subaru place to get checked this morning looks like a sports cat fitted and duff.

 

get a catted pipe on the mot, and swap it back afterwards

exhausts dont take that long to change at all

 

ive just sent my sports cat back for testing as mine too failed the mot with readings of 0.37% first run and 0.58% second run 0.02% with normal cat back on so just waiting for there call to see whats what..........