Maf question. I have a Nissan Versa 1.6L. Just turned 100k. Has never set a code. The other day went for an oil change. When I started the car to drive off my first check engine light appeared. Went back inside, asked the tech to read it on the spot. Maf code popped out. He said “ I can clear it but it”l just come back. My question is, can a tech deliberately do something to trigger that sequence of events or was this the mother of all coincidences? I’m old, and slightly OCD. Give it to me straight. Car runs fine, air filter changes kept up, 3 weeks later code has not returned.