How do you reset the service engine light on a Aztek?

This has to be done with a OBD2 scan tool. You might be able to get your local Auto Zone or Advanced Auto parts to do it. But different government agencies have been telling them not to do it. So you either have to buy the scan tool to do it, or pay to have someone else do it. Its cheaper probably to do it yourself. I think Auto Zone has a small hand held scanner tool for 50 bucks or so. Its the same tool they use to scan your car if you ask them too. Ask them to borrow it so you can reset your light, sometimes the let you do that too..

*** You may also try disconnecting the battery for around 20 minutes. That should reset the ECU also.. Nice and cheap*** If your vehicle still has a problem going on that its sensors find, it will still appear after a moment.