This is the live data I was getting. The first series were about 2 weeks before the second series:

Upstream O2

B1-S1 -0.490 0.290 mA
B2-S1 -0.127 0.124 mA

Downstream O2

B1-S2 0.095 0.210 V
B2-S2 0.435 0.705 V

Fuel Trim

Short Term B1 1.6% 8.0%
Long Term B1 7.0% 7.0%
Short Term B2 1.6% 8.0%
Long Term B2 9.4% 9.4%

2/11/2025

Fuel Trim

Short Term B1 -1.60% 0.00%
Long Term B1 4.70% 4.70%
Short Term B2 -0.80% 0%
Long Term B2 6.30% 6.30%

MAF .6 lb/min 1.9 lb/min

Lambda

B1-S1 1.004 0.997
B2-S1 1.009 1.045

 

Interesting. I get much the same downstream voltages as you're getting. Constant fluctuating from 0.0 to 0.9, and all numbers in between, every second. By contrast, I connected the monitor to one of my BMWs, and downstream voltage was very steady, alternating between 0.65 to 0.75, which I understand is the correct behavior.

Also, LTFT at speed are at -10.2% and -8.7%, Band 1 and Bank 2, respectively. Indicating rich mixture. We'll install a fresh set of injectors this weekend and see if the LTFT numbers improve.