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Thread: EML - Vec B 2.2 Sri 150 - P0420

  1. #1
    Regular Member AntSSSS's Avatar
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    Default EML - Vec B 2.2 Sri 150 - P0420

    So Chaps,

    My new toy decided to throw an EML on me yesterday!..

    Got it on Vaux-Com and the code was as follows:
    P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

    Now - it has just had before I bought it a brand new exhaust from the Manifold back incl a CAT.

    So my thoughts are as follows:
    1) New CAT is duff!
    2) New CAT is NOT the correct one for the car
    3) Lambda / O2 (not sure of the correct name for the sensor that sits in the exhaust) is broken or slightly out of scope.

    I cleared the code and it was fine for a while, but seems to come on when the car gets a little hotter. For instance my journey this morning to work - I reset the light when I started and drove about 7 miles incl a motorway blast - as I came off the motor way and filtered around a few set of traffic lights it came on again.

    Doesnt effect the cars performance or drive in anyway..

    So - what do we think??

    Cheers Anthony

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    Full Member chrisvectra's Avatar
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    you need to get that receipt of the fella you brought the car from mate and get it back to the place that fitted the exhaust and cat because something is not right there.
    either that or try replacing the Lambda sensor
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    I'd go with a new lambda 1st

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    Regular Member AntSSSS's Avatar
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    Yeah so more digging:

    If it was the CAT then bank 2 would be reporting the issue.

    Bank 1 is the sensor before the CAT so looks like that is running slightly out of scope.

    Will change both as a precaution I think.

    I wonder if this is the reason the guy put a new CAT on it - lol... Suits me

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    Full Member chrisvectra's Avatar
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    either that or the cat is wrong one for the car
    VXR IS FOR LIFE NOT JUST FOR THRILLS !



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    Regular Member AntSSSS's Avatar
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    Quote Originally Posted by chrisvectra View Post
    either that or the cat is wrong one for the car
    Yeah thats what I thought - but Bank 1 is before the CAT.. If it was Bank 2 reporting the fault then it could be the CAT as that located after the CAT, but as its Bank 1, the CAT does not effect this reading.
    Looks like a common failure of that sensor now - and it does it in exactly the same way as described...

    Just need to see how much VX want for them now!

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    Full Member chrisvectra's Avatar
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    front pipe 12569391 £75.35 *vat
    rear pipe 12567680 £81.72 + vat
    gotta be cheaper from LMF though
    VXR IS FOR LIFE NOT JUST FOR THRILLS !



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    Regular Member AntSSSS's Avatar
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    Quote Originally Posted by chrisvectra View Post
    front pipe 12569391 £75.35 *vat
    rear pipe 12567680 £81.72 + vat
    gotta be cheaper from LMF though
    Nice one mate!

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    Regular Member Ste's Avatar
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    What has been said above is not right.

    Bank 1 and bank 2 is defining which bank of cylinders, not which O2 sensor.

    If you have an inline 4 cylinder, then you only have Bank 1. Bank 2 comes into play for the V6 engine.

    Bank 1 Sensor 1 is before cat and Bank 1 sensor 2 is after cat.

    Low cat performance is measured by both O2 sensors and looking at the difference between the 2, to give effective cat performance.

    If you don't also have lambda trim faults, then either the second O2 sensor is duff (stuck in range), or the cat is duff, or you have a leak in the exhaust pipe.

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    Regular Member AntSSSS's Avatar
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    Quote Originally Posted by Ste View Post
    What has been said above is not right.

    Bank 1 and bank 2 is defining which bank of cylinders, not which O2 sensor.

    If you have an inline 4 cylinder, then you only have Bank 1. Bank 2 comes into play for the V6 engine.

    Bank 1 Sensor 1 is before cat and Bank 1 sensor 2 is after cat.

    Low cat performance is measured by both O2 sensors and looking at the difference between the 2, to give effective cat performance.

    If you don't also have lambda trim faults, then either the second O2 sensor is duff (stuck in range), or the cat is duff, or you have a leak in the exhaust pipe.
    Ah OK.. understand.

    So I think either way - replace both Lambda sensors and see from there.. Cheaper than a new CAT - and the CAT is new anyway.

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