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Author Topic: P0420 - Catalyst Efficency Above Threshold - on 2.2  (Read 6895 times)

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driver115

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #45 on: 03 April 2015, 14:01:35 »
shortly after purchasing my 3.2 manual back in 2012 , the engine management system light flashed and stayed on, got this error and others I recall, and was going to have sensors moved, then read the cause could be multivarious including exhaust/manifold /gasket  as well as the sensors  so have lived with the EMS light being permanently on, and from time to time it flickers off for a few miles. Periodically, I connect my laptop and reset just to check that the warning light does not point towards some other problem - other than that - not an MOT failure, and have learned to live with it and refrained from disconnecting the light
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #46 on: 03 April 2015, 15:48:07 »
Quote from: TheBoy on 02 April 2015, 19:20:08
Quote from: Marks DTM Calib on 02 April 2015, 08:50:52
If the flexi is goosed then air will be drawn in after the mixture control O2 sensor.....the result will be the code you are seeing.
But to exactly follow front sensor?  :-\

Indeed - what should the sensor 2 graph look like? Flat when at idle?
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #47 on: 08 April 2015, 19:22:39 »
Well 450 miles and the light popped back on again, so looks like new CAT time.

Can anyone help me with what the sensor 2 graph should look like?
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Steve B

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #48 on: 08 April 2015, 19:28:30 »
Quote from: steve6367 on 08 April 2015, 19:22:39
Well 450 miles and the light popped back on again, so looks like new CAT time.

Can anyone help me with what the sensor 2 graph should look like?
I can show you a live data readings of a 2.2 that was running fine  :y
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #49 on: 08 April 2015, 19:36:23 »
That would be great - thank you
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Steve B

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #50 on: 08 April 2015, 19:39:46 »
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #51 on: 08 April 2015, 19:44:17 »
Thank you  :y
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Steve B

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #52 on: 08 April 2015, 19:46:50 »
did you open it with excel  :y

Thats on a hot engine on tickover 2.2
« Last Edit: 08 April 2015, 19:48:23 by BIGtime »
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #53 on: 08 April 2015, 20:29:08 »
Not yet as on tablet, but will do shortly  :y
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