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Old 08-31-2008, 12:42 PM
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Default Help!
My check engine light came on today so I went to autozone. Code P0420. Catalyst 1/1 efficiency below required level. What exactly does this mean? I have a magnaflow high flow cat that is only six months old. ANY help would be much appreciated.
 
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Old 08-31-2008, 01:17 PM
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The pre cat 02 sensor is bad or you need an 02 simm.
 
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Old 08-31-2008, 01:32 PM
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thanks! we'll start with the sensor. You recommend any OEM brands?
 
Last edited by Pandemic Flu; 08-31-2008 at 01:37 PM.
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Old 08-31-2008, 01:40 PM
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1/1 is the left upstream sensor. I have had good luck with the Bosch O2s....
 
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Old 08-31-2008, 02:12 PM
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Like PS says it is the left bank which I forgot to say. However you'll only have one pre cat sensor if its not Cal.
 
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Old 08-31-2008, 02:46 PM
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Thanks guys. Going to pick one up now.
 
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