Avant MOT Failure - Emissions

[sorrentomi16]

Morning all,

My S2 Avant failed the MOT yesterday.. handbrake (go figure!) but also emissions

The tester said he couldn't find the engine code so used a 'default' - looking closer at the fail sheet he has put it down as a Audi NG 2.3 injection..

Results were:
First Fast Idle Test


CO FAIL - 0.6 (Limit <0.3)
HC PASS - 102 (Limit <200)
LAMBDA PASS - 1.02 (Limit <0.3)

Second Fast Idle Test


CO FAIL - 0.67 (Limit <0.3)
HC FAIL - 244 (Limit <200)
LAMBDA PASS - 1.02 (Limit <1.03)

Natural Idle Test


CO FAIL - 0.64 (Limit <0.5)

Car has done 130k, serviced regularly (just had a full service including plugs), engine runs very nicely, no smoke etc, does smell a bit rich though..

Any ideas on where to start? Sensor or cat problem?

Be interested to know how do these results compare to others?

Thanks

[Trist28]

Take it somewhere else!? A small garage specialising in old VAG stuff maybe - I'm sure they will be more amenable.

My local MOT place puts the S2 down as 'un-specified' petrol non cat as the engine code is not on their system. However last 5 or so MOTs on all my old school stuff he hasn't even done an emissions test

[Colesy]

I have the same issues, fortunately my tester is more understanding.

I'll be trying cat cleaner next year which will hopefully be better, another option is to really thrash it before the test to get the cat really hot. This is assuming you have cat issues.

What exhaust do you have fitted?

[irishs2]

My s2 coupe in 2011:

Results were:
Fast Idle Test


CO - 0.12 (Limit <0.3)
HC - 66 (Limit <200)
LAMBDA - 1.01

Low Idle Test


CO - 0.12 (Limit <0.3)
HC - 110 (Limit <200)

[sorrentomi16]

Ok thanks, the car is totally standard but looking at your results mine is completely out then!

Any recommendations around the Bristol area?

[Rusty]

Cats are knackered. 0.67 co at correct lambda is what my sports cat used to do before it got warm. Get the codes read just in case. Where in Bristol are you?

[audinut]

it has no cats in it mate I took them out

[Rusty]

That'll be the issue then

[sorrentomi16]

You said it was standard mate! I've been had!!

So.. Straight to Audi for a replacement or look elsewhere?

[AndyP]

You said it was standard mate! I've been had!!

So.. Straight to Audi for a replacement or look elsewhere?

Good god no! Take vaseline with you if you do

Plenty of Avants have been broken recently try Spink or Andygplym or try putting a wanted ad up.

[audinut]

il swap you my cats if you like

[Key Walshe]

it has no cats in it mate I took them out

Ahahah that made me laugh!!! Yes without the cats it will fail miserably. PM Acidburn as he's broken a few recently. All the best

[sorrentomi16]

Ok thanks I'll ask around here and see if anyone has any..

Failing that its lube time and a trip to the dealer!

[prj]

Whatever you do, don't go to the dealer.
You can get a pair of 200 cell high flow cats and you will pass with flying colors.

I'm sure the Bristol gang can take good care of you

[sorrentomi16]

Prj, if I can't get any used ones, do you know where I can buy high flow / sports cats from if they are cheaper than the dealer ?