P0140 Bank 1 Sensor 2 Insufficient -help-
#1
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Could someone tell me which sensor is throwing this code? Is this a problem with an after cat sensor? I thought Bank 2 was the after cat sensors....
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Not necessarily, see thread:
https://ls1tech.com/forums/pcm-diagnostics-tuning/343118-rich-lean-switch-points-o2-gain-vs-error.html
https://ls1tech.com/forums/pcm-diagnostics-tuning/343118-rich-lean-switch-points-o2-gain-vs-error.html