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Failed it's MOT today

Discussion in 'A4/S4 forum(B5 Chassis)' started by S4_dan, Apr 9, 2011.

  1. S4_dan
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    S4_dan Fire up the Quattro!

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    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
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  2. Alan H
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    Alan H Need a V8 or Bi-Turbo.......

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    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.
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    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.
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  4. Alan H
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    Alan H Need a V8 or Bi-Turbo.......

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    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.
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  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Sensor is the cheapest option :p 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!
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  6. S4_dan
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    S4_dan Fire up the Quattro!

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    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
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  7. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Book an MOT at a garage 5 or 10 miles away :)

    You can then legally drive the car to said MOT.
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  8. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    Sensor is the cheapest option? Thought they were about £60 each and presumably you need 2 on the S4!
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  9. S4_dan
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    S4_dan Fire up the Quattro!

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    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!?
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  10. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    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"!
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  11. Alan H
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    Alan H Need a V8 or Bi-Turbo.......

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    +1
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  12. rasA4
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    rasA4 Four Rings Mafia Specialist

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    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
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  13. S4_dan
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    S4_dan Fire up the Quattro!

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    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?!
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