ECU recordings

[lotus211]

Help me understand- does the ecu record all previous faults and failures over the cars history and not just record mileage, operating hours and revs etc?

[lotus211]

Ok many tks. So if a warning light appears on the dash for a problem does this get recorded on the cars ECU ?
Just curious as to how these things work. My readout on my car is spot on and clear rev ranges but that's all the readout states

[lotus211]

Great tks for info

[lotus211]

Turns out that any fault that appears on the dash gets logged in the ECU immediately so upon a service/inspection a technician can address the fault then when the issue with the car is sorted they can clear the data. Or after something like either 40 turns of the ignition key the data will be cleared though this bit may be inaccurate and is unclear. What however he did say was that if for example you replace the battery then all fault lights that have appeared on the dash will clear from the ECU providing the fault no longer exists.