1998 Dodge Dakota code PO420
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Joined: Apr 2013
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From: Alberta
catalytic convertor efficiency code.
the code sets when the bank 1 pre and post catalytic convertor oxygen sensors start switching(high to low voltage) near the same rate.
this monitor test is run to check the function of the cat. When working properly, the front 02 should switch quickly, the rears should switch slowly. So the exhaust may have a leak, the 02 sensors may be bad or the convertor is no good.
If any other codes are set...post them in case they are related.
the code sets when the bank 1 pre and post catalytic convertor oxygen sensors start switching(high to low voltage) near the same rate.
this monitor test is run to check the function of the cat. When working properly, the front 02 should switch quickly, the rears should switch slowly. So the exhaust may have a leak, the 02 sensors may be bad or the convertor is no good.
If any other codes are set...post them in case they are related.