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VW Polo Fault codes

simfin Feb 18, 2011

  1. simfin

    simfin New Member VCDS Map User

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    Had my Sons Polo looked at by a very kind garage that used a VCDS to check the codes. Below is the result - 3 intermittants and a normal one. The codes have been cleared which has cleared the Orange engine warning light and has stayed off for 10 miles driving back.

    I know it is not an Audi, but does anyone have any clues what may have been the problem - specifically the non-intermittant code 16804. It is a 1.2 E '52 plate


    [​IMG]
     
  2. hades-

    hades- Well-Known Member VCDS Map User

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    im gona go for 02 sensor or cat
    16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

    Possible Causes

    • Leakage in Intake and/or Exhaust System
    • Catalyst faulty
    • Oxygen Sensor(s) faulty
    • Oxygen Sensor(s) Control faulty
    Possible Solutions

    • Check Intake and Exhaust System for Leaks
    • Check Catalyst
    • Check Oxygen Sensor(s)
    • Check Oxygen Sensor(s) Control
      • Perform Oxygen Sensor(s) Aging Check
     
  3. hades-

    hades- Well-Known Member VCDS Map User

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    your 16556 will go with the 16804 code
     
  4. simfin

    simfin New Member VCDS Map User

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    Excellent, thanks for the info - Hope it isnt the Cat :(


    Where do I find the cross referance for the fault codes? Is it freely available ?
     
  5. simfin

    simfin New Member VCDS Map User

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    Ahhh, dont worry , found it on ross tech. thanks again
     
  6. NHN

    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    Yeah I'd also go with O2 sensor 1st.
     

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