Check Engine light is on in your 2003 Mazda Pickup B-2000 Just bought it and had everything checked outIs it triggered by mileage?

Check Engine Light is triggered by a fault with the emissions system. You have a problem with the emissions system. Code is stored in ECU and can be accessed with an OBD2 scan tool. Maintenance Required Light is triggered by mileage and just means service is required, normally oil change.