01 Passat 215000 miles.
I did a bunch of repairs to eliminate emissions dash light.
How many miles do I have to drive before all codes reset, so I can have the car rechecked for emissions again??
I've read 100-150, but it's not about a certain mileage. The car needs to be driven under several scenarios, like accelerating to a certain speed, going at a constant speed for a number of miles, etc. There's a post with a detailed description on this, I can't find it now, but try searching for it.
It all depends on the drive cycle, there is no exact mileage figure. Do you have a code reader? If so, just check your I/m monitors to see if they are ready or not. Those cars usually take about 60 miles to get the codes ready. In most states, you can have one incomplete readiness code on a 2001 model