Quote Originally Posted by Dieseldude View Post
You're welcome.

Faults are classified into two types, passive and active. Only passive faults (past corrected faults still logged in the ECU) are deleted when the battery is disconnected. Active faults cannot be deleted unless they have been corrected.
Yeah. I cannot even imagine how these logged data (faults) help to control fuelling of the engine.

On the assumption that there is an O2 sensor available, does the computer box actually log O2 sensor readings, and use this to optimize fuel injection and desired emission? In my limited knowledge, I don't believe so. It should be referring to real time data, so to speak, shouldn't it?