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Thread: P0421 Catalyst 1 Efficiency Below Threshold Bank 1

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  1. P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    as above guys, had engine management light come on Monday after a 150 mile drive. Car is A4 2003 3.0 v6 (petrol). Came up with the above fault code when scanned

    Any ideas please?
     
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  2. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    IMG_7346.jpg

    Tried several times to rotate it 180 degrees, both on here and on my PC but to no avail, so apologies in advance guys
     
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  3. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    The catalytic converter is gone !!
     
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  4. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    Quote Originally Posted by mishu67ro View Post
    The catalytic converter is gone !!
    Definately? How can you tell from the screenshot? (Genuinely interested by the way)
     
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  5. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    Just my opinion, I would take it for the biggest thrash of its life. Italian tuneup.... clear codes.

    Report back in a week.
     
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  6. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    Hey Skezza

    Ironically, it only came on after a 3 hour blast (which it never gets, she only does 10 miles a day, 5 miles each way to wrk and back). Done a fast 3 hour (3 hours each way) trip to visit family and the light came on on my way home? Had the code/fault cleared last week and (touch wood), it's not returned (yet....)

    I'll keep an eye on it and report back if it returns...
     
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  7. Re: P0421 Catalyst 1 Efficiency Below Threshold Bank 1 
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    But was it a proper blast or were you pottering at 50mph on the m6? Honestly, it does make a difference.
     
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