Stalling 09 Tacoma

Truck will start every time, and immediately stall within a couple seconds. Giving it gas will keep it running for only a few seconds more, but it immediately stalls again.

Previous to this I’d heard a high pitch soft volume whining that seemed to come from closer to the back of the engine that has a sound similar to a squealing belt but quieter (it’s not the belt though). I could make the whine stop by accelerating. Right before the constant stalling issue the whine was there constantly and wouldn’t go away with acceleration.

The codes I’m getting are:
P0156 o2 sensor circuit bank2 sensor2

knock sensor 2 circuit high bank 2

Any ideas?

Thanks, Dan

 

2.7L or 4.0L engine?

 

4.0L

 

Can you get a Video of the noise?

 

Unable to upload anything. I’ve got almost no bandwidth here at my home. I’ll try to tomorrow at my local library.