I was wondering about those specifications from this GREEN book.

By any chance could you trace those readings back to the ECU pins and back probe there.
Art may have done this already, knowing his ways of documentation.

In itself, I think those readings might be inconclusive. As no one really knows what their doing when it's good or bad.
If you engine is running poorly is AMM causing it or a ECU reacting to it.

If you had specs as to know what the air input is, then you should expect a certain reading being sent to the ECU.
Volume, temperature, humidity and atmospheric pressure. All can be known roughly with common instruments or local weather. Volume would be displacement of the engine and the RPM's.
One would have these on a graph chart. Something like that, Bosch definitely has and rebuilders should have one as well.


If you check those pins at the ECU with those same readings you are getting now, it would at least prove its getting there and rule out a wiring harness issue. Any voltage drop should be negligible, so if you saw any, it might be clue to the randomness.

The codes are saying the Lambda is missing, according to another post, Not just rich or lean.
That's only two components, the AMM input and the end result from the O2 sensor.

The TPS said you were cruising as well! A Totally missing code and the other vague code will still trip on the light!
If those two are doing the tango, the ECU is the final judge in the dance!

The FPR fiasco on another post, just plain beats ya in the head!
There has to be a common denominator in here!

Darn it!

Phil