cats

I have a 2000 TJ with the 2 pre-cat exhaust. I am removing the oil pan and have read conflicting info on whether or not the oil pan comes out just by unbolting the 2 pre-cats or if you have to drop the trans skid plate and unbolt the entire intermediate piece from the pre-cat to the main cat...

I am troubleshooting a p0431 code on my 05 Sport, "warm-up catalyst efficiency below threshold, bank 2". I have ordered both NTK o2 upstream sensors which may correct the problem. However I plan to also replace the Pre cats as PM cuz it has 101k. I plan to unbolt the 2 pipes connected to the...

On day 3 of my new to me 05 Sport with 101k I'm in rush hour traffic, the tj bucks 1x and the CEL comes on. AZ reads the CEL and it shows a P-0431 code which says... "Warm Up Catalyst Efficiency Below Threshold (Bank 2)" There are two catalytic converters coming off the exhaust manifold. My...

Have 04 wrangler with 4.0, p0432 code, can I remove both pre cats and the main cat with no problem

What's the difference between a CARB vs. NON CARB compliant catalytic converter system? I have an 06 X with 4.0. I'm considering replacing my cat system with Magaflow system. There are two offerings, part number 93649(non-carb compliant) and 458027 (carb compliant). Does the jeep ECM know if...

What are Bank 1, Bank 2, etc.? Since this question pops up from time-to-time, here's an easy to follow diagram that illustrates what they mean when your OBDII code scanner (or manual) tells you something like "O2 sensor, Bank 1, Sensor 2": What does upstream and downstream mean? Simple...