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Ibiza Mk4 For the 2002 - 2008 model

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Old 20-01-2011, 20:17   #1
mark_eisner
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P0420 fault code

I've been getting a recurring DTC: P0420: Catalyst System; Bank 1: Efficiency Below Threshold

No obvious symptoms but I think the economy is reduced (running rich?)

It's on a 1.2 12V 2003 Ibiza

I have replaced the pre-cat oxygen sensor but the code keeps coming back. The other things that the Ross-Tech wiki says are to check the catalyst and check the intake and exhaust systems. I'm assuming it means check for leaks. The exhaust system I can check easily but the intake system is a little more complex. Where are the places I should check and how do I check? I know there isn't a gapping hole in the throttle body so I assume it will be more subtle.

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Old 20-01-2011, 22:26   #2
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We have had a couple of these and fixed them with a replacement air flow meter.
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Old 21-01-2011, 08:39   #3
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Thanks, will look into it!
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Old 21-01-2011, 08:50   #4
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I can't find any reference to the air flow meter (MAF) for the 1.2. I've looked on parts sites and in my haynes manual, the only reference is for diesels.

Is the part you mean the joint intake pressure/temperature sensor. I think also MAP?
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Old 21-01-2011, 09:45   #5
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Yes sorry just a terminology thing
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Old 21-01-2011, 16:16   #6
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Thought so, just inexperienced!
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Old 24-01-2011, 16:58   #7
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I've just replaced my MAP. The old one had oily deposits all around the probe, is this normal?
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Old 25-01-2011, 16:10   #8
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Yes it can do from recirculation from cam cover, did it fix the problem?
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Old 25-01-2011, 17:23   #9
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Not sure yet, am going for a drive in about 20 mins, the fault code usually only came on after the second motorway journey. It was fine on the first 70 then the code came back up the second time. Quite predictably actually.
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Old 25-01-2011, 18:17   #10
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Worth looking for green furry corrosion on the O2 sensor multiplug ;-)
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Old 25-01-2011, 19:10   #11
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The post-CAT O2 sensor? Does that just need a clean or sensor replacement?
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Old 25-01-2011, 20:08   #12
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Is there a way to check what is broken/has a bad connection with vag-com? Looking at the outputs etc to see if it's nonsense? I just don't know what readings are normal etc...
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