P0151 code - O2 sensors

[AXCL]

I believe it is fairly obvious, however can someone verify for me...

A) Where the upstream O2 sensors are
B) Which one is Bank 1 vs Bank 2

I can see what I'm assuming are the 2 sensors after the manifold and before the cat. Both are underneath, one is near the front of the engine, the other is behind.

Thanks!

 

[Ntrain]

Upstream means before the cat.

Bank 1 is on the rear IIRC.

 

[AXCL]

Thanks for the prompt reply. So I had the "before the cat" part correct. Not sure what you mean by "on the rear IIRC"?

The P0151 code states Bank 2 Sensor 1. I don't have access to a lift, so I'm really hoping it is the sensor right in the front. If I drop the air intake from the bottom of the Explorer Sport, I believe you can access this Bank 2 Sensor 1 right from the bottom front of the Explorer. Is this correct? I now a pic would be good, so if its not clear, I'll take a pic later.

 

[peterk9]

IIRC = If I Recall Correctly.

Peter