P0136 and P0137 B1S2 low voltage

Connector to the A/F sensor on driver's side secondary sensor B1S2 got pulled out and spliced back together on my 2008 4.7. Replaced 2nd sensor with new Denso and same results. Readings from all other sensors seem normal, movement coincides with B2S2 but voltage is way low.. could this be an issue with my ECM/ECU/PCM? Thing is driving me a little crazy trying to pass inspection and it's my only code with occasional P0136 with the p0137

 

By “spliced back in” was there not an existing OEM connector?

Did the codes return after replacing?

Just so we’re speaking the same language, BxS2 refers to the downstream (after catalytic converter) Oxygen sensor… these are “narrow band” and produce a voltage signal between 0-0.9 volts and bounce around quite a bit between “high/rich” or “low/lean”

the BxS1 sensors are the upstream (before catalytic converter) “wide band” oxygen sensors, sometimes called Air/Fuel Ratio sensors. These provide a 0-5v signal corresponding to actual A/F mixture.

according to your photos, the voltage ranges are normal.