Running fine, no misfiring, normal fuel consumption. Any suggestions what to look for causing this code?

 

Anything? MAF?

 

When were the upstream O2 sensors replaced?

 

I have no clue but not getting any 02 sensor faults.

 

You are not getting a MAF code either, yet you suggested it. Point is faulty things don’t necessarily generate codes. And when it’s specific to one bank, it’s usually a component specific to that side. A bad MAF would likely cause fault codes for both banks.

 

Ok anyone tell me what's up with this. Looks like ranges are way extreme on short

 

Changed MAF, changed PVC. New oil filler, found small crack on intake baffle, fixed that. Changed throttle body gasket. No signs of any vacuum leakes or intake. Still getting lean codes both banks now. I'll check fuel pressure next I suppose. Mpg is right on 14-16

 

While running spray brake cleaner/starting fluid around the motor looking for leaks. Oil fill pipe, around injectors, etc.

If no change when spraying, assume MAF(both banks).

If that does not fix it a good BG fuel rail and intake cleaning should.

 

BG fuel rail and intake cleaning?