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VW Polo emissions fail

  • 02-09-2018 10:25PM
    #1
    DAVIDI
    Registered Users, Registered Users 2 Posts: 5 ✭


    Just bought a 1.2 VW Polo 2006. It had failed the nct on high emissions on the high idle.
    Lambda was 1.10 (Should be between 0.97 and 1.03) co was 2.08% (should be less than 0.20%) HC was ok.
    There was a check engine light on and the codes 16804:catalyst system bank 1 efficiency below threshold and 16556: Fuel trim bank 1, system too rich.
    Any ideas on what to replace?
    There doesnt appear to be any exhaust leaks


Comments

  • #2
    Alanstrainor
    Registered Users, Registered Users 2 Posts: 23,157 ✭✭✭✭Alanstrainor


    Googling those codes suggests exhaust leaks to be a likely cause of your issues. But there's also suggestions of failed o2 sensors. I think I'd want the exhaust checked properly.


  • #3
    BorneTobyWilde
    Registered Users, Registered Users 2 Posts: 37,314 ✭✭✭✭BorneTobyWilde


    Usually the converter on these polos, costly enough to buy and then fit. Would cost around 300 and to fit maybe 100 if no other issues.


  • #4
    marzic
    Registered Users, Registered Users 2 Posts: 784 ✭✭✭marzic


    About 15 yrs ago I had a '95 carina e, tested it 3 months early and it failed emission test. I dosed it every couple weeks with fuel additive (and skipped retest) till the nct due date and it passed. Would you give that a go?


  • #5
    DAVIDI
    Registered Users, Registered Users 2 Posts: 5 ✭DAVIDI


    Thanks for the advice lads.
    I gave it a good service, dipetane, cat cleaner, cleaned the map sensor and throttle body.
    Replaced the 2 oxygen sensor with 2 off a polo that recently passed the test.
    Had a retest this evening and still failed slightly on co.
    Is it time to change the cat?


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