Engine Mechanical problem
2001 Hyundai Santa Fe 4 cyl Front Wheel Drive Automatic 111720 miles
I've been having trouble with code P0421. I had the catalytic converter replaced and it went away. Two days later the check engine light came back on so I went back to the mechanic and he cleared the code. Then 3 days later the check engine light came back on again with the same P0421 code. The scanner says it has two codes but they are both P0421. I don't know whats going on. Could it be that the oxygen sensors are faulty? Also when I come to a stop at a red light somewhere or anywhere where I stop and hold the brakes. Sometimes the car feels like it jumps. It doesn't move forward but it just feels like some sort of bump. It runs fine but the only problem that comes up is code P0421. Anyone have any suggestions? Thanks.
I also understand that there are two cat. Converters; one on the front of the car and one on the bottom center of the car. The one I had replaced was the bottom center one. Will I need to replace the front cat?
Wednesday, December 17th, 2008 AT 11:29 PM