The check engine light came on while driving. I pulled over and found that a small hose was disconnected, so I reconnected it. I'm not sure if that's what caused the light to come on or not, but it's still lit.
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You should also clean the throttle body too, the MAF are very sensitive check all connections again any small air leak like a small folded hose underneath, also if you disconnected the pigtail always be sure to disconnect the neg terminal on the battery anytime unplugging electrical components.
These small leaks can drive you crazy! The best advise I can give is to follow every hose in the fuel vapor system from end to end and look for cracks in the hoses. If you find any, no matter how minor they are, either cut back the bad end if there's enough or replace it. Also check the clamps on all hoses including the filler to the tank.
If you want you can have a shop " smoke " the system which may help pinpoint the leak, my experiance has been that this method dosen't always work well on the smaller leaks.
Coed 17-Engine is cold to long, check your thermostat. Follow the upper radiator hose to the engine to locate the thermostat. Recommend disconnecting negative battery cable before replacing it. A repair manual is handy for the replacement procedure. While you're at it, check the hoses for replacement if needed.
If you have the sedan as I do, open your hood, and looking straight in, it will be on the left side (passenger side) of the engine. On the sedan model it can be found under the large upper radiator hose. There should be two small retaining bolts, and then the sensor simply pulls out.
Small vacuum leak to start in evap system, which can quite often be traced back to gas cap. I'd clean gas cap seal good & add a little Vaseline, to the rubber "O" ring on cap, and wipe surface where cap screws in real good & clean, then have codes erased, or disconnect battery for a few seconds, and then see if it comes back. Make sure you put cap on tight after adding fuel.
P0442 is a medium evaporative system leak detected. Check your gas cap and make sure it is on tight and the rubber seal is in good shape. If it was loose, tighten it and the check engine light will exstinguish after a few days on its own. If not this usually means there is a small hose in the system that has developed a small split. It could be several other things as well, it is "usually" a hose. You need to take it to a shop that can proform diagnostics to locate the leak.
Here is a list of possable causes;
LEAK AT GAS CAP