msaluta
Newbie
Have a 1997 C1500 2wd. Recently the P0161 code popped up.
I looked at the ENG-1 fuse and it's gtg.
I replaced the passenger side, downstream O2 sensor with a Bosch, inspected the wiring harness which appeared to be gtg, and cleared the code.
This resolved the issue for approximately three days. This morning the same P0161 code pops up.
I'm trying to understand what to troubleshoot next. Continuity seems obvious to test. But from there I've read some folks look at EGR valves and cats and I'm trying to replace only items that need it.
I looked at the ENG-1 fuse and it's gtg.
I replaced the passenger side, downstream O2 sensor with a Bosch, inspected the wiring harness which appeared to be gtg, and cleared the code.
This resolved the issue for approximately three days. This morning the same P0161 code pops up.
I'm trying to understand what to troubleshoot next. Continuity seems obvious to test. But from there I've read some folks look at EGR valves and cats and I'm trying to replace only items that need it.
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