...p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working ...
2001pontiac grand prix gt codes p0440 and p0420 The p0440 code is a loose gas cap code the p0420 code is a catalytic converter problem code.
obd2 code p0420 ok have you 02 sensor replace and your catalytic converter
...p0420 shows up ,Catalyst System Efficiency Below Threshold. now would i have to replace the converter or just maybe the o2 sensors that may have gone bad to cause this okay, if you replace the ...
P0420 means catalyst sytem efficiency below threshold (bank 1). the catalytic converter has an oxygen sensor in front and behind it. this code basically means a converter is not working as efficiently
...resistance is high Internal short or open in the heater element Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed ...
...pressure into the gas tank may be defective. P0420 is catalyst efficiency means that most like it needs a catalytic converter. P0455 most likely needs a EVAP vent solenoid both items are very
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...it and have a Catalytic converter efficiency testing done . P0420 is a Catalytic converter efficiency code http://www.obd-codes.com/p0420 P0420 How To Diagnose Bad Catalytic Converter ...
...catalytic converter failures are caused by a problem or ... P0420 Error Code: Catalyst System Efficiency Below ... www.obd-codes.com/p0420 Repair information for the OBD-II trouble code P0420 - ...
...converter. It has failed the efficiency test. See this post for the full story on P0420 trouble codes
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