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Thread: MOT fail on emissions

  1. #1
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    MOT fail on emissions

    Hello all

    Our poor 2003 MK4 Polo E 1.2 petrol 6v has failed its MOT today on emissions

    I was wondering if there is any way of temporarily reducing the emissions enough to pass? (and confronting the underlying issue another time)

    Long drive, fuel / engine additives etc? I guess this depends if we just missed the threshold, or if we are way off..


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    Thanks to the kind members of this forum we believe we have an issue with worn valve guides.

    Although this is affecting performance the car only does very low mileage so we can live with that for now, but I guess this issue hasn't helped in the emissions test!

    Any advice or suggestions would be be greatly appreciated as always
    2003 Polo 1.2

  2. #2
    Administrator Keithuk's Avatar
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    I wonder why that picture shows all engine speeds not checked, as you can't check emissions without the engine running?
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
    Administrator Crasher's Avatar
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    Because the inspector can’t be bothered to connect the pickup. The cat on these engines is known for failure.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  4. #4
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    Quote Originally Posted by Crasher View Post
    The cat on these engines is known for failure.
    Would it be worth replacing the cat and going for a retest?
    2003 Polo 1.2

  5. #5
    Administrator Keithuk's Avatar
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    It depends what is wrong.

    You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

    As cats aren't cheap if you find the correct part number on https://volkswagen.7zap.com/en/rdw/ keep this in your favorites/bookmarks for reference. As it will save me checking ETKA.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  6. #6
    Administrator Crasher's Avatar
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    Quote Originally Posted by Poloroid View Post
    Would it be worth replacing the cat and going for a retest?
    As Keith says there could be an underlying problem that has caused the cat to fail such as poor compression caused by worn valve guides which is an endemic problem with this engine but also could be just the cat or a simple sensor failure so it needs diagnostic work by someone with the knowledge and equipment.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  7. #7
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    Water leak!

    Hello all - Just have an update on this one..

    We have had the cylinder head reconditioned with new valves etc and have put everything back together today.

    However when we filled the coolant back up noticed we have a water leak on the battery side of the cylinder head.

    It is coming from a black plastic part which is held in place by 4 allen head bolts. We had removed this and then bolted back on but it obviously hasn't sealed correctly and is leaking.

    There was no sign of sealant when we removed it and no gasket in place.

    Hopefully this image shows the part.. it is in front of the throttle body on the side of the cylinder head.

    Does anyone know what this is, and any suggestions how best to rectify??



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    2003 Polo 1.2

  8. #8
    Administrator Crasher's Avatar
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    That is the thermostat housing, the O ring has gone missing, VW part number 03C 121 119 D and 6.38 from a VW dealer.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

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