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take it to the nearest advance auto they plug in a small computer and it will tell you exactly what those code mean for free or you can buy your own diagnostic computer for about $80
Code 463 is for a problem with the fuel sending unit circuit. The most common cause is a faulty sending unit or a problem with the wiring harness to the tank.
The P0463 code (Fuel Level Sensor Circuit High Voltage) means that your fuel guage circuit is open. To fix the fuel guage, the tank must come out to replace the sending unit. Personally I wouldn't worry about it too much. Use your trip guage and fill up after 200/250 miles. You'll never run out.
PO442 indicates a fuel vapor leak in the EVAP control system. It means a very
small leak has been detected. In fact, the leak can be from a hole as small
as 0.04" in diameter. The (EVAP) emission control system prevents the escape
of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses
to a charcoal canister for storage. Later, when the engine is running a purge
control valve opens allowing intake vacuum to siphon the fuel vapors into the
engine.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
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
It means there is a problem in the fuel sending unit circuit. The PCM uses a 5v reference on this system to calculate fuel level. There is either a problem in the sending unit or related wires.
po463 is the fuel level sensor. the oxygen sensors are the ones that send a signal to the computor to adjust the rich/lean fuel mixture. Have them checked.
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