Hi
@S1C , there was another person on this forum that had a really hard time getting his EVAP monitor to pass (I do not recall which thread, or who now - I would have to search) - but in an effort to help, I reset all of my monitors and had to drive approx. 1600 miles before my EVAP monitor passed. (All others passed before that, and I updated once or twice during the process). That was with a stock tune on my '18 Abarth. The evaporitive system controls on our car are complicated, and different from most makes. All of that having been said, all bets are off once an aftermarket tune is programmed in, so I agree with the others here that making sure you have a stock tune is #1. After that,
@madfiat would be correct - it's probably gonna take you more than 250 miles to get all of the monitors to pass. I suggest you Google "OBD Drive Cycle" and read several articles to see and understand exactly what is involved - it requires a very specific driving pattern that varies somewhat between manufacturers and models to get every monitor to run. After a related repair I will clear codes and test drive my customer's car two drive cycles up to approx. 20 miles (depending on what code was set), monitor engine data, and make sure the Check Engine light does not illuminate before returning to the customer. When I return the car to my customer, I explain that these are not "OBD Drive Cycle" test drives, only test drives to verify the car is operating properly during the time I drove it, because doing an OBD Drive Cycle is almost completely impossible to do in a reasonable amount of time - and within the time that the customer wants his car back before he starts screaming at me for taking too long! (I understand - he wants his car back, albeit fixed). I also explain that in some cases like intermittent issues that we cannot duplicate on demand or such as the EVAP or O2 / Cat monitors not running for example, that they may need to bring the car back for further diagnostics / repair. This is the reality of it all. Good Luck, ask more questions, keep us updated! Best, s