Marky Dissod
Full Access Member
The answer has nothing to do with miles at all.How many miles do you have to drive for the readiness monitors to be set?
Each monitor has a different set of conditions for its self-test routines.
When that self-test passes, it considers itself 'Ready'. Before the test, it's 'Not Ready'. (It can also fail its test, and throw a code.)
Knew a mechanic in the mid-2000s, had a book that told how to drive (or NOT) based on which monitor(s) were not yet ready, to ready them as soon as possible.
Only a few customers were ever allowed to read it, most other customers paid him money to keep the car for two days so he could drive it as cited in the book.
He'd always return it to them 3-4 days later.
For example:
if your EVAP system is 'Not Ready', keep the tank as close to 1/2 as possible, and try to start the car (after shutting it off) when coolant temp is ≈176F-185F.
Again, NOTHING to do with miles.
O2 sensors simply need to warm up from the cold a few times.
Catalytic converter test basically involves the rear O2s reporting .1V or .2V consistently for a given period of time in closed loop.