1999 Hyundai Elantra Questions

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how do i replace the bulb as the third brake light

I replaced input and output speed sensors and it still Wil not shift it does not slip thanks

My son has a 1999 Hyundai elantra that started acting really sluggish about a month ago. I noticed it had an exhaust leak and we looked at the front cat ( they have 2) and it was glowing red hot. The flexible exhaust pipe connected to it was glowing red hot and torn in half, hence the leak. First thought was back pressure from lower cat. Had to replace upper car and flex. Did that and started car. Car started fine and sounded great for about 5 minutes. Noticed lots of white exhaust and fuel smell. Looked at new cat and of course it was glowing red hot. Looked at spark plugs. Two of them looked fouled with strong gas smell. Changed those and fired car up. Again sounded great for 5 minutes. Again cat starts to get hot. Thinking upstream o2 sensor or fuel pressure regulator. Everything I read leads me to believe there is too much fuel being burned in catalytic converter. Please help. Have good mechanic skills but diagnosing this is testing my limits.

I only bought the car 3 weeks ago

hose is in the front near the rediator

up and i got told it could be an oxygen sensor because it started stalling in fast accelaration 0-60

can't figure out how to get to the bulbs!

ilustrate them

i have changed the transmission fluid, and still has no reverse, when i put it in drive it will jerk down into the next gear, any answers for me

when my boyfriend sprayed with starting fluid it started then cut out..fuel pump??? is it in the tank?

I am getting confured.

My check engine light came on 5 days ago, but I assumed it was due to my exhaust. I believe I need my exhaust replaced as it is extremely loud when I drive it. But why won't my car turn over??

left side half shaft leaking