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Thread: P0420 Fault Code

  1. #1
    Regular Member Hyperhart's Avatar
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    Vehicle InfoStats

    Vehicle : Astra GTC VXR

    Trim : VXR

    Engine : 2.0t

    Year : 2013

    Default P0420 Fault Code

    Hi, this is really getting on my nerves now so any help or advice will be greatly received. 3 weeks ago i picked up a 2003 Vectra Turbo but the emissions light came on after 5 mins of driving, with this it went back to the garage i brought the car from and had it reset only for it to come back on after another 5 mins. Firstly they said that it was because the co2 sensor wire had been cut so they repaired it. The car has now been in and out of the garage more times than i can remember in the last 3 weeks and nothing really seems to be sorted so i put it on the diagnostics machine at work. It came back with code P0420 (Catalyst System Below Threshold ( Bank 1 ) ), could this be down to the co2 sensor or worse still could it be the cat. Car runs fine but need to get it sorted as i only have 2 months left on my warranty. Cheers.

  2. #2
    Regular Member paul wingnut's Avatar
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    Vehicle : vectra sri 150


    Engine : 1900 cdti 150

    Year : 2008

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    more likely its the cat m8 second o2 sensor is reading incorrect mixture you could drop frontpipe look inside see if it has broke up

  3. #3
    Regular Member Hyperhart's Avatar
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    Vehicle : Astra GTC VXR

    Trim : VXR

    Engine : 2.0t

    Year : 2013

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    Could this also cause irregular idling. When cold idle starts at just under 1000rpm and gradually works its way up to about 2500rpm. Also holds revs slightly when lifting off the throttle to change gear. Garage doing the work to the car are changing the throttle body for the idling issue but are they just wasting their time and money.

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