Default Engine code p420

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Jul 15, 2016 | 08:32 PM

Gmanvilla

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Joined: Mar 2012

Posts: 35

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From: Birmingham

Default Engine code p420

Default Engine code p420
Hi,
I keep getting engine error code P420, I've checked what it's connected to. Can anyone advise my options.

Many thanks.

Jul 15, 2016 | 08:44 PM

studabear

PassionFord Post Whore!!

Joined: Aug 2005

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From: at home

What car and is the cat still fitted?

Jul 15, 2016 | 09:54 PM

Gmanvilla

Thread Starter

Joined: Mar 2012

Posts: 35

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From: Birmingham

Focus st170, not sure about the cat still being fitted.

Jul 16, 2016 | 03:59 AM

B19 JUB

Advanced PassionFord User

Joined: Jul 2004

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From: saafend

normally means catalyst effiency below threshold.basically cat is knackered if its not been removed

Jul 16, 2016 | 11:30 AM

Gmanvilla

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Joined: Mar 2012

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From: Birmingham

Cheers, what sort of cost am I looking at.

Jul 16, 2016 | 12:00 PM

studabear

PassionFord Post Whore!!

Joined: Aug 2005

Posts: 8,349

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From: at home

If it still passes the emissions with the cat fitted but still brings the light on with that code you could fit a lambda spacer on the post cat sensor.

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