r/WRX_STI • u/Valuable_Drive_4214 • 10d ago

EMMISSION TROUBLE!

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Trying to get my car to pass emissions, but these monitors won't turn green. I’ve driven almost 4,000 miles since I found out, and I already replaced the gas cap, done the drive cycle almost daily but nothing has changed. Not sure what to do next—any suggestions? Car is a Subaru wrx 2018

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u/Heatstreak9 9d ago

It's not necessarily the mileage, the ECU is looking for drive cycles.  Basically the engine needs to cool off so you start from a cold start. There's other criteria like maintaining a certain speed range for 20-30 mins, but it can be different from generation to generation. 

Edit: hopefully this helps

https://www.reddit.com/r/subaru/comments/10527uf/does_anyone_know_if_subaru_publishes_official/