I have a P3 as well. When driving, the voltage reads 0.0. When I come to a stop and am idling with my foot on the brake, I'll often see it settle at 3.4-3.5V and hold there until I take my foot off the pedal, at which time it drops back to 0.0.
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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