A minor (or major?) success with the DTC's.
Setting all o2 sensor 1 DTC to 'no error', and all trim DTC to 'no error' has cleared all readiness tests for me.
I haven't driven the car yet. Read DTC's before flash; oxygen sensor + heater incomplete. Flashed tune, read DTC's; all complete, 0 emission DTC.
Might pose a future problem if running closed loop. I'm currently open loop, so will see how it goes when I get a chance to drive.
Also, be good to find which exact codes completed the tests. I just mass disabled for now, but if it only needs a couple, even better.
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