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Old 06-08-2011, 05:42 AM
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Default * PO422-Main Catalyst Efficiency Below Threshold Bank1

Got the Check Engine Light on once again... here's the deal, got the PO422 code triggered. I've got a brand new Bosch MAF Sensor, Bosch Upstream & Downstream O2 Sensors (2yrs. old), New Catalytic Converter (5 yrs. old). Checked for exhaust leaks, visual inspection of converter, no holes or rattles and the exhaust manifold looks good as well. Average mileage per year around 6K. Only 21K since brand new converter.

Any other ideas on what might be causing the light to be on??????????????

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Old 06-08-2011, 12:43 PM
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you may have a clogged cat again, or the o2 sensors may be dirty from bad fuel or running too rich, have you added any additives to your fuel lately could be that as well, (octane booster etc.)
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Old 06-08-2011, 03:45 PM
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Hi, no additives to fuel of any kind added. Have been using only Shell regular gasoline because of it's cleaning agents. I just can't believe it's the Cat or the Sensors.


Really frustrating
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Old 06-11-2011, 08:15 PM
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New is not 5 years old... That's mid life... The mileage is relatively low though.

What brand of Converter?

What kind of oil are you running? Does it burn any oil?
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Old 06-13-2011, 12:01 AM
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Not sure... it was an after market converter that was installed by Midas. Never burns any oil and I use a Pennzoil 10w-30w
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