A code P0430 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak
First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2.
In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.
A code P0442 most likely means one or more of the following has happened:
* A loose or improperly affixed "gas" cap
* A non-conforming gas cap (i.E. Not factory/original brand)
* A small leak/hole in a fuel vapor hose/tube
* Other small leak in EVAP system "Vapor Canister Purge Valve"
* Faulty vent o-ring seal
With a P0442, the most common repair is to:
* Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
* Otherwise, replace the gas cap, or
* Inspect the EVAP system for cuts/holes in tubes/hoses.
* Faulty Vapor Canister Purge Valve.
* ONE TIME I WENT FOR THE MOST EXPENSIVE PART, THE "VAPOR CANISTER PURGE VALVE". IT TOOK CARE OF IT. I PULLED IT OFF A CAR IN THE JUNK YARD (CAN'T BEAT THE PRICE)!
SOMETIMES IT IS JUST A GAS CAP!
You can pull a purge valve off of a car in the Junk or Salvage yard if you have one near by to save some money.
I hope this information helped.
Saturday, November 28th, 2009 AT 11:46 PM