2012 Tundra Mass Air Flow error p0102

I've read the threads and used my code reader in trace mode: Air flow goes up and down with throttle. Apparently that's a good sign. Engine idles and runs fine. But P0102 persists. Error can not be cleared and remains in the "error code" library. I cleaned the sensor with no effect.
I have after market HD Magnaflow cats for a year now since mine were all stolen, if that's even relevant.
Any ideas how to measure the sensor heater wire or other before I buy new OEM for over $100?

 

I found a doc on the web that says resistance between terminals 4&5 on the MAF sensor should be 0.493 to 0.667 kOhm at 140F. Its 110F here in Austin and I'm measuring 0.880 kOhm which seems in range on the temperature-resistance chart I found.
Any other ideas of items I could check that trigger P0102 ?