What does it normally mean if the long term fuel trims is greater than 20% of the short term fuel trims? The only code listed is p0430 so outside of it being the Bank 2 cat is there anything else obvious to check? Injectors? Coils? Sparks? MAF Sensor? Vaccum leaks?

Would you recommend the Lacquer method to see if it can overcome a P0430 code in the V8?



Hmmm. I'll throw some thoughts at this and you can make of them what you will.
First thing, more of an FYI is that the threshold for cat efficiency is very low, something like 5% I think. Ie if your cat is ...

Did you solve your misfires in the end?

Hi,

I'm seeing the dreaded P0430 code after the car was misfiring severely for a few months.

I've replaced the rear O2 Sensor, and that code has returned after a few weeks.

How difficult is it to replace the Bank 2 CAT, and is this possible as a DIY task?

Thank you

Hi,

How did you go in the end after running thinner through the tank?

Did you need to replace the bank 2 cat in the end? Is that difficult to do without pulling the whole engine apart?

Thanks

I'm also seeing the same code, and wanted to ask whether the O2 sensors can be replaced from underneath the car? I'm also a little confused by the sensors that can be purchased on fcpauto where there are upstream, downstream, front left, front right, and rear right, and rear left.

Any help would ...