You knew what this sensor will measure? Intermediary - fuel temperature! So more sense is to measure fuel temperature directly. There we can really see 10% deviation from frost temperatures to engine temperatures... This is why we see lean condition after 15 minutes restarting on hot engine!
And anyway last decade we see more and more returnless fuel rails in OEM. How they handle keep stoich before oxygen sensor is ready?
Regarding air density. I wrote it here before:
1) avoid from stupid sensors what measure manifold temperature! This one is best what I found:
2) mount sensor as close as possible to intake valves and in flow [usually in manifold after the throttle]. Sensor should measure not ambient temperature, but temperature of air passing to cylinder!
3) make additional 2D or make current as 3D table for gas law correction: from MAT (we have it) and from air mass flow (like VE*rpm).
More air passes the sensor, model becomes more close to ideal gas law.
In general this is very important basement for fuel injection. I am disappointed - MS nowadays has tons of smart features. But it worth nothing if we have difficulties to keep fueling as WE want.
Gints.
