O2 sensor

[Brians4x4]

I've had a check engine light for about two weeks and emmisions testing is coming up so I took my Tahoe to advance auto and got it scanned. The man working there said I had low input on my second bank o2 sensors. He said it could be wiring or defective o2 sensor. It happened a couple days after I took it threw some mud pits. What should I do to test them or fix the problem?

[1.721afr]

I've had a check engine light for about two weeks and emmisions testing is coming up so I took my Tahoe to advance auto and got it scanned. The man working there said I had low input on my second bank o2 sensors. He said it could be wiring or defective o2 sensor. It happened a couple days after I took it threw some mud pits. What should I do to test them or fix the problem?

Sounds like your o2 is covered in mud, they have to breathe, for real.

You need to check wires & connectors for damage or contamination.