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po121 is throttle position sensor is out of range.po442 is emissions system leak detected small leak.po455 is same as po442 but large leak.po496 is high purge flow . Check all the vacuum lines plastic also cause one of them is broken.
That is an emissions code. It means you have a small leak in one of the lines. Most likely it the line that goes from the engine to the evap canister in the drivers side rear inner fender well.
this is a evaporative emissions code. which means there is a leak in the piping or something leading to the gasoline tank that is allowing fuel vapors to escape. More often than not the gas cap isn't tight or needs to be replaced.
try these first
po442= evap emission control system leak (small) po742= torque converter clutch soleniod circuit stuck on i got these out of the booklet for my code reader po442pd wasn't listed
EVAP Codes. You will have to go thru entire evap system,looking for a small leak (po442) Hoses,Switches,Valves etc. See if you can borrow a smoke machine.
PO442 is an Evaporation Emission leak. It's probably a loose gas cap.
The fix would be $96.00 at our dealership, since your truck is out of
warranty. You may be able to get it fixed cheaper, but you'll be
charged a diagnostic fee.
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