Failed it's MOT today

[S4_dan]

Well guys, Car failed today. Not happy.

1 - Offside side repeater insecure - Now secured.

2 - Fuel system component leaking - Fuel Filter, bleeding thing was fine two weeks ago! Easy fix.

3 - (Both) headlamp aim too high - Again, easy fix

4 - Exhaust emissions carbon monoxide content after 2nd fast idle excessive - How do i get this down?! Was revved for ages to try and lower but lowest reading was 0.561% needs to be 0.300%

5 - Exhaust emissions Lambda reading after 2nd fast idle outside specified limits - due to number 4!

6 - Rear brake application uneven - O/S/R caliper wants freeing up as its sticking.

Mainly little things. But how the heck do i get the emissions down? Car has been stood for about 8months before i rebuilt the engine. It's been running for about a total of 90mins idling and i gave it a sprightly drive to the testing station but still wasnt enough to clean it up.

Also, got an advisory for insecure headlamps. As far as i'm aware, i refitted them perfectly. But must of missed something.

Any advice guys?

Cheers,

Dan

 

[Alan H]

It surprising what a good service will do to lower the emissions. And if that doesn't work, perhaps a dose of "cataclean" It's a very good product that does as it name suggests.......

Google it, you'll find it.

 

[aragorn]

For your emissions its either a faulty lambda sensor or a dead cat.

I would expect however that given it specifically mentions the lambda value is incorrect, its probably the sensor. A dead cat usually means the lambda value is spot on, but the CO figure is too high. A scan with vagcom will probably confirm.

 

[Alan H]

For your emissions its either a faulty lambda sensor or a dead cat.

I would expect however that given it specifically mentions the lambda value is incorrect, its probably the sensor. A dead cat usually means the lambda value is spot on, but the CO figure is too high. A scan with vagcom will probably confirm.

Agree with that, but I always try the cheapest option first.....

Do you do short round town trips? or motorway? or a combination of the two?

Short trips are a nightmare for putting the emissions up......

You could even just take it down the motorway for a couple of junctions, that'll give it a bit of a clear out.

 

[aragorn]

Sensor is the cheapest option Really need to vagcom first though to see which sensor is faulty.

I think he suggested in his post that hes given it a decent drive before the MOT, and most decent testers will hold the engine at 3000rpm for quite a few minutes in an attempt to get the emissions to come down. Its also a freshly rebuilt engine, so less likely to be gunked up inside from short journeys!

 

[S4_dan]

I've heard of cataclean so will try that.

This is first time i've driven the car properly. I bought it a non runner and it had only covered just over 1k miles since its last mot which it passed fine. So it's due to the car being stood i guess for the emissions. I'll go and scan the car tomorrow with vag-com and see what comes up.

I cant really take it along the A64 due to no tax/mot. Dont want it taking of me and getting crushed! lol

 

[aragorn]

Book an MOT at a garage 5 or 10 miles away

You can then legally drive the car to said MOT.

 

[AndyMac]

Sensor is the cheapest option? Thought they were about £60 each and presumably you need 2 on the S4!

 

[S4_dan]

Its my 2.8 V6 Quattro that needss moting. My S4 was sold :-( Biggest regret of my life!

But there is still two sensors on the 2.8 and still gotta be cheaper than two cats!?

 

[AndyMac]

Well neither of my sensors work since having the CATs replaced and it passed OK (amazingly), and they didn't even charge me the obligatory tenner for the headlight "adjustment"!

 

[Alan H]

Book an MOT at a garage 5 or 10 miles away

You can then legally drive the car to said MOT.

+1

 

[rasA4]

Hi dan where do you purchase you fuel from?
May be try Shell V Power, Tesco 99 Ron or BP ultimate it might make some difference to emissions

 

[S4_dan]

Hi RasA4 haven't put any in it as it had half a tank already! But could be an idea to fill with fresh fuel?!