DTC P0430 Catalyst System Low Efficiency Bank 2
What is your current mileage?
What were the original symptoms/codes that were occuring that led you to replace the first cat?
What were the original symptoms/codes that were occuring that led you to replace the second cat?
The only code currently popping is the p0430 & the ONLY symptom is "Car won't get past 60 on highway"?
More details are much better than less.
1. Do you think a cat would go bad in just 2 or 8 months?
Only if bank 2 cylinder/s had been misfiring for quite awhile. You would have noticed something.
2. Should I just replace the 02 sensor in order to fix the power issue?
If you are over 100K, I would replace all four sensors as they get lazy with age.
Current Mileage: 150K
What were the original symptoms/codes that were occuring that led you to replace the first cat?:
The original symptoms were extreme loss of power to the point where it could not even move past 10 - 15 miles per hour...crawled up hills...weird rattling sound, also car jerked around a lot with rpms moving up and down while idling. Pressing gas resulted in extreme power loss. You cold see the mph lever actually move way down. Diagnosed as bad cat and multiple misfires. I had to replace the cat along with the spark plugs and wires. Code I believe was P0420 and P0300. They said I should replace the second cat too, but I didn't have the money until months later.
What were the original symptoms/codes that were occurring that led you to replace the second cat?
The original codes/symptoms were again extreme loss of power...couldn't get past 20 or 30 mph. Pressing gas pedal led to decrease in power. I knew from the first experience that I needed to replace the second cat, which I already had laying around the house. I had bought it previously, but never had it installed. Once I had it installed, problem went away. Car drove just fine. This was back in late January.
***I don't think the O2 sensors were replaced when I replaced these cats (unless they come with the cat which I don't believe to be true) because I didn't purchase new ones. So, that would mean they are the same old O2 sensors on both new cats.***
The only code currently popping up is the p0430 & the ONLY symptom is "Car won't get past 60 on highway"?:
Yes, that is the ONLY symptom and ONLY code they are pulling. Otherwise the car drives fine. There is no decrease in power when gas is pressed. The local shop that I most recently brought it to stated that just replacing the 02 sensors most likely will not resolve the "can't get past 60" problem.
More details: My problem feels like this...when I first got the car, I could step on the gas half way and it would accelerate fast. When I floored the gas, it would accelerate really fast...I was like "wow, this car is pretty damn fast!" Now, I step on the gas half way and it barely has a response. It does get a bit faster, but not by much at all. I have to stay in the right lane and drive like an old lady. BTW, I am not an aggressive driver. I don't accelerate hard after a stop. I am usually in the left lane going about 70 - 75. I might even go 80, but that is my limit.