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run the fault codes first to determine the failure
engine lights report on engine and transmission
check coolant levels , sump oil levels, over heating, transmission oil levels for obvious problems and the codes will report on sensors and the like
Don't worry about that light, if performance and fuel economy is good. The light is still a fault from the evaporative canister.. It should not affect performance. Just make sure the fuel cap is snug. Just perform The ODBII scan periodically to catch any future problems. The vacume diaphragm for canister purge should be unplugged and the vacume hose plugged. This will avoid engine from sucking fuel into the engine due to a ruptured diaphragm in the canister
Your engine light can come on for about a million reasons. Its best to go to a part store most have computers and some will hook up your car at no charge and tell you the code its showing.
sometimes this can be simply you didn't tighten your gas cap all the way. Remove your gas cap, then put it back on and be sure it clicks 3 times. The engine light will not go out right away, it takes a few trips out, around 3-4, hope this is helpful. Good luck
This is usually caused by a gas cap that was not put on properly after a fill up. If this is the case then simply tighten the gas cap and the check engine light should go out in a few days with regular driving or reset with a code reader. You may have to replace the gas cap if the code remains. be sure to get the correct cap.
I would guess one of the valves are sticking or the lifters, but to me it sounds like the oil pump is either clogged or not working. Which would explain the engine light and the tapping sound. I hope this helps Tim
Well an engine vacuum leak can cause the P0171 code to come on and having an oil cap missing is a vacuum leak. The first response for this code is to replace the O2 sensor because that is what the code is for...bad O2 sensor reading. Now too much air from a vacuum leak can cause a lean condition in the exhaust. If they are going to replace the O2 sensor for free then let them..If you trust them to replace it. It is possible that the lean condition could have damaged the O2 sensor. You may find that after a few days of driving with the cap back on the check engine light might go back off. I do not think anaything would be permanently damaged as long as the oil level did not get too low and nothing got into the engine thru the open hole in the valve cover. Does the car seem to be running ok? No overheating, miss, ect.