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P0420 Geo and Mazda

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May 10, 2011, 7:32 AM

Post #1 of 2 (2484 views)
P0420 Geo and Mazda Sign In

Both of these cars, each in excess of 130,000 miles, is showing code 0420 "catalyst efficiency below threshold Bank 1"

Is that the catalytic converter? The question comes from one lady just replaced the converter a year ago.

Neither vehicle shows any codes for the 02 sensors.

Hammer Time
Ultimate Carjunky / Moderator
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May 10, 2011, 7:57 AM

Post #2 of 2 (2481 views)
Re: P0420 Geo and Mazda Sign In

95% of the time, that is a bad Converter. If she just had hers replaced, then it is under warranty. They carry a mandatory 5yr/50K


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