Getting code P2070 which goes of by itself.

code p2070 refers to intake manifold air control actuator--actuator stuck open or refers to intake manifold air control solenoid --solenoid stuck open=== causes ---wiring---intake manifold air control actuator---mechanical fault OR---wiring---intake manifold air control solenoid---mechanical fault.

with the engine cold spray the intake manifold near the gasket with the carb cleaner see if the idle changes if it does replace the gasket

Diagnostic Trouble Codes - 1993
Jeep

11 IGN reference signal. 13 Fault in the map sensor pneumatic circuit. 14 Fault in the map sensor electrical circuit. 15 Fault in the vehicle speed sensor circuit.

Code 171 means the O2 sensor is telling the computer the fuel mixture for bank one is too lean. Bank one is the side with cylinder number one. The problem could be the sensor, or something else like an injector that is actually causing the fuel mixture to be lean. The sensor would need to be checked.

The code you mention, P0172 - Fuel Trim Malfunction - System Too Rich (Bank 1)
The engine is a 2.0 lit (4 cylinder). Have you checked to see if the vehicle's powertrain is still under warranty (to include fuel system problems)? If original owner & under 100,000 miles, it may very well be under the powertrain warranty. Check with your nearest Hyundai Dealership & ask the appropriate questions.

My experience with this particular Fuel Trim Malfunction:

1. Clogged engine air filter restricting proper intake air flow
2. Leaky fuel injectors
3. Fuel pressure too high
4. Faulty MAF (Mass Air Flow Meter/Sensor).
5. Faulty TPS (Throttle Position Sensor).
6. Faulty Intake Air Temperature Sensor (IAT)
7. Faulty Engine Coolant Temperature Sensor (ECT).

These causes are only offered as a place to start looking/diagnosing -- NOT intended to cause you to start throwing money after engine parts which may not be the cause -- have it properly diagnosed (probably under warranty).

Hope this helps.

Congratulations on getting it to run like a champ.

The ABS light is likely due to a bad wheel speed sensor, which would be consistent with the speedometer coming and going.

Try to get an Actron Brakescan Tool for about $99 or so plus shipping, and you can scan the codes and get English explanations of which circuit is bad.

I purchased one to diagnose and repair a 1997 Cadillac Deville. The Actron Brakescan tool covers most American vehicles from 1996 to 2005. So, this diagnosis should be right up the alley of this tool.

One can go from there as far as checking out the sensors and the wiring more closely.

Check the engine control unit itself and the ignition module.

vaccum leak or faulty sensor could be the problem. If you have the check engine code. that would help so much. along the lines of not getting enough fuel....maybe....maybe not, check the fuel pressure, if its fine, something else.... realy need the engine code. oh, could also be the oxygen sensor, if its fouled up that would cause the engine to surge and stall. BUT if the check engine light is on, you need to find out what code it is. you can manualy look this up using your owners manual, it will give you specific instruction on how to extract the code out of the computer.

good luck

The Cat code could have cleared itself if the computer doesn't detect a problem anymore. Fix the EGR problem as it is still active.

The check engine light comes ON when the cars computer(the ECU) notices any kind of electrical problem in car.In some cases the check engine light comes on then turns off.In that case the exact error is not getting confirmed so this happens.But once the problem gets confirmed the engine light will remain permanently ON till the problem gets solved.In this case i suggest you to get your car scanned at autozone service center.Its absolutely free.In case in the car scanning,if any error code is retrieved then you can check which part is faulty as per the error code.In case if no error code is retrieved then you can continue driving,till you get any confirmed indication. ---------- This will help.Thanks.Helpmech.