code P0432 and P0422 after changing bad coil
 

Hey, all; I need some help. My 2002 S80 T6 was previously misfiring. Based on this website, I was able to determine that it was a faulty coil on cylinder 6. I replaced the coil and it drives much better now (almost perfectly); however, the Check Engine light is on and is generating codes P0432 and P0422. When I'm coasting at around 50 mph (in top gear), I notice a very slight hesitation if I lightly touch the gas pedal to gradually speed up. It almost feels like the injector may be clogged and I have to give it a decent amount of gas to get good acceleration, but I don't know. Any ideas??

Thanks for your help.

P0422 Main catalyst converter, bank 1 - efficiency below threshold
P0432 ... bank 2...

Any idea what the most likely cause is? Is it likely something simple that caused these codes to occur?

Thanks; that helps... From the research I've done on the forums, the main possibilities that I've seen are cracked hose, O2 sensor, or air mass meter sensor... I guess I'll try the cheapest route first and look for any cracks in the air intake system, then work from there... I wish I knew for sure... Thanks for your help!!

Maybe your bad coil made injector to spray unburned gasoline into catalyst. Don't know what consequences could that made...

Yeah, I read some posts that mention that too. I hope that's didn't interfere with anything. I originally thought it was bad gas, so I finished out one tank of gas, then Refueled with another tank of gas (spiked with Lucas fuel system cleaner). I hope that wasn't enough to cause any real or expensive damage. Yesterday, I bought some Mass Air Flow Sensor cleaner to spray on the sensor. I also bought some Sea Foam additive to put in the crank case and fuel line. I figure these are some low-cost troubleshooting options to explore first. Keep your fingers crossed for me.

Good luck.