check engine light

Hello, I'm relatively new here (sorry if this post is in the wrong place or anything!), but figured I would ask since Googling hasn't gotten me anywhere. So long story short, I had error codes for O2 Sensor in Bank 1 which since has been replaced, however at the same time I had an error code...

Problem solved: a ket-3 fuse/relay thing was damaged, 2 fuses blown, and a endlink.

I have check engine light. Autozone drew code #P0420 ( possible catalytic converter defective). After-market part cost $300. Scott Kilmer suggested pouring a gallon of pure lacquer thinner into the half-full gas tank and drive 150 miles and it will clean the cat converter and erase check...

Yesterday I replaced several light bulbs in the gauges of my '03 Elantra. I was surprised to find out that there are so many bulbs there. Basically there are three different sizes of bulbs: large, medium and tiny. I had ordered all the bulbs necessary to change from a local Hyundai dealer...

My 2002 Elantra has been in the dealers shop a few times for the check engine light, I replace both with Bosh parts and dealer said they need to be dealer parts, is this true, that light is still on, next time at dealer with the light problem they said my flex pipe had some leaks around the...

Been to dealership 'A' thrice...no codes found...no problems found! This is why I had to video it. Dealer A welded a exhaust manifold crack, when it had a code the first time. They also changed the plugs and wires. The light never stays on! I don't have ABS brakes! Now, the same deal. Any...

Last night I noticed a the check engine light was on and I noticed it was on after I filled up the gas, so I thought it was the gas cap. I fixed that and the CEL is still there (even after turning the car off, driving for 30+ minutes, and this morning when I started the car up again). I...