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Default Engine code p420

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Old Jul 15, 2016 | 08:32 PM
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Default 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.
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Old Jul 15, 2016 | 08:44 PM
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What car and is the cat still fitted?
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Old Jul 15, 2016 | 09:54 PM
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Focus st170, not sure about the cat still being fitted.
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Old Jul 16, 2016 | 03:59 AM
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normally means catalyst effiency below threshold.basically cat is knackered if its not been removed
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Old Jul 16, 2016 | 11:30 AM
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Cheers, what sort of cost am I looking at.
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Old Jul 16, 2016 | 12:00 PM
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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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