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Thread: Polo fails MOT on emissions CO2 @ 3 years old

  1. #1
    Junior Member
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    Apr 2019
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    Polo fails MOT on emissions CO2 @ 3 years old

    2016 Polo 1.2 Bluemotion (petrol). 30,000 miles. Full dealer service history. I've had the car for 6 months.

    First MOT due and car just (1 month) out of warranty. I'm attaching results.

    Took to local independent garage for MOT and it failed. CO2 reading 0.63%. Maximum allowed 0.20%. They told me that car of this age and mileage should not have these readings - something is wrong with it they think. My suspicions that fuel economy not what it should be for this engine are roused!

    Service also due at same time so it then goes to local VW dealer for diagnostics to see what's wrong. They come back and report 0.19% CO2 and say nothing wrong. Everything checks out okay and no warnings.

    Seems to drive smoother/quieter after the service so I wonder if they did something in addition to the oil change. Firmware of somesuch?

    So, back to independent for re-test of emissions. Still high. See attached.

    So my question here is what to do?

    - take to another independent for 3rd opinion
    - are VW trying to avoid having to contribute goodwill for anything that really needs fixing - as said it's just out of warranty?
    - is 0.19% actually okay for a three year old engine of this type and the independent garage doesn't know that?
    - if i get it passed via VW will I run into issues when next MOT due - does it get worse?
    - take it up with Driver & Vehical Standards Agency?

    Thanks in advance for any wisdom here!


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  2. #2
    Administrator Keithuk's Avatar
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    Jun 2012
    Stoke on Trent
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    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.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.

  3. #3
    Senior Member
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    Jul 2017
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    Definitely something wrong; 0.19 is a bad result even for a much, much older car.

    MOT doesn't test CO2 though.
    It's CO, carbon monoxide, that is being measured.

    Our 14 year old Skoda Fabia got better numbers than even VW's 'questionable' measurements of yours, at its last test at 165000 miles a month or two back.

  4. Thanks Crasher thanked for this post
  5. #4
    Administrator Crasher's Avatar
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    Apr 2006
    Nottingham, England
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    It could benefit from an Italian tune....
    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:

  6. #5
    Join Date
    Dec 2010
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    It wouldnít surprise me if VW were playing fast and loose with those figures. Find out what the CO specs for the engine are and ask them to hit the target. My wifeís polo has recently been idling rough and the engine light has been coming on for short periods before going out - but only at idle! I expect the CO is high than itís supposed to be and Iím suspecting the lambda sensor is either coated in silicon from poor quality fuel additives, the sensor is faulty or it just needs a clean. Iíll take it in to let them have a look when itís convenient for me.

    How does the car idle?
    Last edited by VeeDub; 01-05-19 at 03:57.

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