Question about 2003 Toyota Corolla
P0420 is a code for catalytic converter efficiency, the cat will need to be replaced. in some instances a software upgrade to the engine computer may be needed
Posted on Dec 23, 2008
CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.
Posted on Aug 30, 2009
Open the back trunk, look near the top of the trunk, and pull the two black levers. They have a seat folding down symbol. That will release the locks to fold the back seat down.
Posted on Jul 04, 2009
it is located in the engine compartment fuse / junction box it is on the drivers side then cover to the box will show you witch one it is ( the relay will be white in color)
Posted on May 30, 2009
Hello, welcome to FixYa.
The fusebox for an 03 Corolla is on the driver's side of the dash, above the plastic panel that is above your knees. You can see it by looking up and to the left, under the instrument pane, with a flashlight. It is a rather large white or cream-coloured box (depending on where the car was produced). An easier way to get to the fuses would be to remove the plastic trim panel that is directly under the bottom of the instrument panel.
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Posted on Jul 20, 2010
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Posted on Jan 02, 2017
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