CEL on MAF or o2 Sensor?? Please help me:)

[violametallic-S-]

I have a CEL, hooked it up to a scanner and it said "o2 sensor circut, slow response, bank 2 sensor 1"

First question, which one is that?

And second is, i read that it can be the MAF triggering the CEL, how can you test it to know for sure what the problem is?

I cleared the CEL, it came on 2 days later, same diagnosis. and I cleared it again and it hasent come on in about a week, but it sure rides like garbage! power loss for sure and just not smooth at all.

I bought all 4 OEM Bosch sensors and will be replacing them soon, but now im worried if it could be the MAF. I dont want to throw out 400 dollars for the CEL to come one again.

Can someone please give me some advice?

Thanks in advance.

[cvhs18472]

One way to check if it an MAF problem is to get some MAF cleaner and use it. Another is to simply unplug the MAF and see how it runs. Ed