20 Most Recent 2004 Hyundai Elantra - Page 4 Questions & Answers

Have you replaced the fuel filter . A clogged fuel filter can cause fuel filter can cause poor power problems . Try to accelerate quickly and see it the engine cuts out as it is running out of gas . If it does change the filter . Hope this corrects the problem

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engine compartment on the driver side the famous black box

This could be the brake pads dragging or it could be a wheel bearing. You can check one or the other. The wheel bearing is tested by jacking up the car with that wheel off the ground and see if you can rock the wheel side to side or up and down. The way to check the brakes is to take the wheel off and look at the brake pads.

this refers to heated O2 sensor heater circuit too high. chances are the sensor is bad.

check the fuse bro.

The codes that i have pulled out relates to Oxygen sensor and Catalyst converter faults. P0420: Catalytic converter system,Bank 1,efficiency below threshold. P2251: Heated Oxygen Sensor (H02S)1, Bank 1, negative current control open circuit. But not necessary the faults. You need to run the scope to see wht patterns u get on the oxygen sensor, and on the obd scanner you may be able to pick up oxygen sensor coming on and going off or rich or lean mixture and the mvolts of the sensor. Also check if the wires are not broken on the sensor. Sometimes a clogged O2 sensor can cause these problems.

It will come out you really have to pull on it hard if that dont work get a good pry bar up close to the tranny and find a spot where you can get a good bite on the axle and pry it will come out.

You need a piece of wood against the tranaxle case, to protect it Then use a 3 foot pry bar behind the axle & snap it, so the Cir Clip comes loose & out of the trans side gear Going back together is tricky but easier

hard to trouble shoot but it seems theres a electrical issue or you ISC (idle speed control) is going bad because this valve closes and opens when the a/c is on or the power steering is in use at idle, did you check for OBD2 codes? try cleaning the throttle body with some carb cleaner and also the ISC valve,heres a pic of what it looks like you will have to remove the air cleaner and next to the throttle body you will see this valve it's also common for they to fail after high milage. good luck!

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P0755 Shift Solenoid B Malfunction cam not find the P1529 you can call auto zone maybe they can help

The OE alarm is part of the ETACS
To disable it:
1) Sound the alarm
2) Put the key in the ignition and turn to start
3) Hold there until the alarm turns off
You should now be able to start the vehicle. The alarm will remain dis-armed until armed through RKE