Having problems with your 2004 Chevrolet Impala ?

Trouble code po420?

\015 Whats parts do code po420 affect?\015 Posted / edited by AnonymousUser on : 21-01-2019

Answers :

That is the code for the catalytic convertor. it is either bad or not working at optimal levels. In most cases this in not such a big deal unless you live in a state that does emission testing buy pug in and not tail pipe emissions. Most states now use a quick OBD II plug-in \012test to check emissions compliance on 1996 and newer vehicles. The \012plug-in test is faster, easier and cheaper to do than a loaded mode \012tailpipe emissions test on a road simulator or dynamo-meter. The rules \012in most states say to pass the OBD II plug-in test, the vehicle (1) must\012 have a fully-functional OBD II system (Check Engine lamp works and the \012diagnostic connector communicated with the engine computer), that the \012Check Engine light must be off and that there are no\012 current codes in the computer's memory. If this is the case than you're going to have to replace the converter.
Sum cars have one or tow oxygen sencors start from engine manifolt up to the and off catalytic convertor and you notes them change the firts one with new.remuvecatalytic convertor end look up the skys se ef is blook you can clean that but dont tuch it eff is broken remuve it fit a good one
Repair Help & Product Troubleshooting for 2004 Chevrolet Impala

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