Updating catalyst control center
If you simply change parts hoping it will solve the problem, you're really just guessing and wasting money.
This site is here for information purposes only and is meant to help you learn more about the dtc and decide if you can tackle the repair yourself. As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1).
The reality is there is still something wrong and your car needs attention in order to be in excellent running condition.
The other likely thing is the rear O2 (oxygen) sensor is no longer working properly.If your car's check engine light is on, get that code read in case it's a P0420.A P0420 code is a trouble code on OBD-II equipped vehicles.I had those replaced and the car ran terrible so I took it back. I took it back and they stated it was now a P0420 code which was the catalyst and I needed to take it to Ford because it was under warranty mandated by the State. I have just recently chaged my o2 sensor and my check engine light just came on and I checked it with a scanner and the po420 code came up. converter and the shop i took it 2 cost me 54 bucks just for the guy 2 cut off the braket and weld a peice of pipe 2 it. So I went with the next best thing and the correct size pipes, , but it did not help, still had the Check Engine light.They informed me that they had crossed the coil wires and fixed it. I took it to Ford, paid for another diagnostic test and was told they could not check the catalyst until "a leak at the O ring" was fixed. Then I tried the next best thing to that, 0, lasted 2 weeks, and still had the light.