Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: CTS CODE PO420
most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.
Posted on Jul 02, 2008
P0420 is catalyst system efficiency below threshold (bank 1)
P0440 is evaporative emission control system malfunction
P0441 is evaporative emission control system incorrect purge flow
Posted on Mar 29, 2009
The fuel pump is vapor locking, common problem in high temp/altitude states. Call the dealer and see if campaign t-13 applies to your car, if the car was originally sold in a low altitude state, it won't apply. I recommend the fuel pump be replaced with updated fuel pump sub assy.
Posted on May 11, 2009
P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.
Posted on May 29, 2009
If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.
Posted on Sep 02, 2009
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