I am replacing a fuel tank strap for a 2005 Hyundai elantra GLS 2.0L I ran in to a problem getting the new strap in on the side where is suppose to go in to a hole and hooks in there .Anyone knows what the trick is,I twisted it left and right and never was able to get it in.On the other side of the tank is easy ,just screws on a 15 mm bolt and done.

SOURCE: oil change procedure on a 2005 Hyundai elantra

it is very easy to change the oil put the car on ramps secure the back end look for the drain plug underneath the engine make sure you have the right size wrench and when you remove the plug also check the gasket on the plug to make sure it is not cracked you will also need an oil filter wrench and my other suggestion to you is to go to autozone to see if they have a Haynes repair manual for your car and if they don't see if they can order you one in the mean time they can also print you off a diagram of how to change the oil in you car safely

SOURCE: Replacing passenger side mirror and casing

you need to remove the trim pannel parallel to the mirror on the inside of the vehicle, normally triangle shaped, from there there will be 3-4 nuts or bolts you need to remove, once that is done the mirror will be free to be removed.

GOOD LUCK

SOURCE: where is the thermostat located in a 2005 hyundai

top radiator hose goes to engine its under that housing

SOURCE: Adjustment headlights '02 Hyundai Elantra

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

SOURCE: 2003 Hyundai Elantra GLS. Check engine light, code PO133

Did you use a aftermarket O2 sensor or a genuine Hyundai one? If it's an aftermarket one it may be bad or not as good as the OEM one. See here for more details and other potential causes: P0133