SOURCE: changed coolant sensor on 99 monte carlo, cleared computer, light
Which coolant sensor did you change? The one in the passenger side tank in the radiator.
SOURCE: Check engine light/ dash message "tighten gas cap"
I can't tell you where yours is but I can tell you how to find it. It's a plastic (sometimes metal) cylinder about the size of a normal coffee can. it has a flat vacuum fitting on the top with usually three or four hoses going to it. Normally it is located low against one of the fenders and can usually be seen easier than you can reach it with your hand. on the bottom you will see a cloth filter. If you can find something like that, you have found it.
I would also check the lines and hoses going to the fuel tank. Any leak in the vapor recovery system will show up as a cap leak which is only a part of the system. (just did one on a Pontiac GA with a similar problem)
SOURCE: Check engine light/gas cap will not stay tight.
yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.
SOURCE: '07 Tahoe; check engine light on steady. Just came
Have a dealer or garage check your Oxygen (O2) sensor. As a quick fix, try disconnecting and reconnecting your car battery. Sometimes this will reset the check engine light.Good Luck!
SOURCE: check engine light on says check gas cap
The evaporative emissions system uses a vaccuum pump to check the fuel system to make sure that fuel vapors cannot escape into the atmosphere. If you leave fuel cap loose the computer will detect it and set a computer code and turn on the check engine light. If the cap is tight and the light still comes on, you may have other problems. Hopefully your vehicle is still under warranty, as evaporative emission system leaks can be very difficult to locate and repair, even for the dealership mechanics.
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