Hi, I am getting this code on my honda pllot and trying to figure out which o2 sensor to change out.
I think the P0430 is Bank 1 Sensor 2, which is the downstream sensor. I think I have located all 4 sensors and the two that are accessible from the top of the motor all have 5 wires, the part purchased from my parts store only has 4 wires and I think I found the two underneath the motor but not sure iff it is the front sensor or the back sensor? Also, many posts discuss the downstream sensors are on or behind the catalytic converter however I don't see anything near the catalytic converter?
Any help would be appreciated, I know this may be the catalytic converter but trying this cheaper option first to see if it resolves the error.
Thanks

 

P0430 is Bank 2, not Bank 1. Bank 2 on the Pilot is related to the front primary cat converter.

Usually, it will be due to a bad primary cat converter, not the downstream oxygen sensor. Replacing the downstream sensor is usually just a temporary bandage.

 

The Pilot has two separate primary converters integrated as part of the exhaust manifolds, one for each bank; and then an under-floor converter. What you were probably looking at that had no sensors was the under-floor converter.

P0430 will most likely be due to a bad cat. It is not like older cars where it can be due to the O2 sensors.