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I'd strongly recommend against the PLX devices, i've emailed PLX several times and they've continued to ignore my emails.

Out $200 :(

Sensor or the whole combo?

Pro interface (with the capacitor at the pro end). Could it be grounding? I grounded it to the main fuse box under the hood

LQ4 with a PLX AFR mounted 30" or so downstream on bank 1. When I bought the PLX a month ago, i never bothered to see what it read on closed loop. I tuned the VE according to the AFR error, but now...