My check engine light is on and I got my catalytic converter replaced and that wasn't the problem. I used a scanner to determine what codes I would get and it's reading Bank 1 and Bank 2. It's not specifying which sensors. I know one of the codes is PO430. Does this mean that all four of my sensors are bad when it doesn't specify any individual sensor.

Please help

My check engine light is on and I got my catalytic converter replaced and that wasn't the problem. I used a scanner to determine what codes I would get and it's reading Bank 1 and Bank 2. It's not specifying which sensors. I know one of the codes is PO430. Does this mean that all four of my sensors are bad when it doesn't specify any individual sensor.?

Please help
What year, make and model and what engine option?
I have resources I'd like to check...
Rarely do all sensors fail simultaneously.

I have a 2001 Nissan Sentra 1.8l
Mileage 150k

I will look at the diag charts for the P0430, but you said, "One of the codes..." Are there others as well? If so what are they? And were all the codes cleared after the cat was replaced?

The codes were cleared after the new cat was installed. The 2 codes that were displayed were PO430 and PO420.

Both of those code speak to catalyst efficiency. I don't have access to dealer diag charts on that car, but what I've read since your OP is that further hands on diag will be the best. Who is doing your repairs?

A friend of mine that is an mechanic will be doing the repair. Is there something else that I can purchase that will help me to diagnose which sensor it is?