2000 mitsubishi galante "service engine soon" light just came on

Does the engine need servicing? The service engine soon light will only comes on if there is a problem. It will not come on if the bulb is burned out. Or. If there are no issues.

code p 442 refers to evaporative emission (EVAP) system---small leak detected
it also refers to large leak detected --fuel cap off/loose === causes hose/connection,-- intake leak--EVAP canister---EVAP canister purge valve --mechanical fault --- EVAP pressure sensor

the engine service soon indicate may be you need to change oil or you need to replace timing belt

it means the engine needs to be servised it works on milage traveled

this could be anything from a losse petrol cap, to a loose vaccuum line, or a fault with a sensor...or womething else...very hard to diagnose without the error code number...which the engine computer logs when the light comes on......you need to take the vewhilce to a mechanic, or auto-zone on the us who will read the codes for you...this will give you the directioin to which will find the answer

this is your check engine or service engine soon light or mil {malfunction indicator lamp} your ecm has detected a fault in the systems it monitors and should have a diagnostic trouble code stored you will need to hook to a scanner /code reader and read codes this will tell reason light came on and loss of power if you have a auto zone nearby they provide this service free of charge

PO170 is a fuel trim malufunction. On a V6 this applies to the rear cylinder head. Lots of possibilities as fu"el trim" refers to the volume air flow sensor, fuel injector, fuel pressure, engine coolant senor, air intake sensor, barometric pressure sensor, oxygen sensor, intake air leaks, or cracks in the exhaust manifold

The Service Engine Soon light is a notice from the vehicles on-board computer that a problem has been detected somewhere, and service is required. You can isolate the problem by having the "trouble code" displayed for you at an auto parts store for FREE to determine the exact problem, and possible causes. This should be done FIRST, so that you strategically approach the problem directly instead of spending unnecessary money "guessing or assuming". If you are trying to save a few bucks, you may want to invest in a Chilton's manual for you vehicle as well for step-by-step repair, and diagnostic info specifically for your vehicle. I hope this helps,...and good luck!!

replace o2 sensor.

it mearns that the computer is sensing a failure. You will need to see if it has logged any codes, and troubleshoot from there. You can go to many auto parts suppliers (autozone, ect) and many will read the codes for you, or you can purchase code reader and do it yourself