Where is the reset button for check engine light on a 1996 BMW 328i?

There's no single "reset button" for the Check Engine Light (CEL) on a 1996 BMW 328i (or most modern cars). The light illuminates because the car's onboard computer (OBD-II system) has detected a problem. Simply pressing a button won't fix the underlying issue.

To clear the CEL, you'll need to:

1. Diagnose the problem: First, you must determine *why* the light is on. This usually requires a diagnostic scan tool (OBD-II scanner) that can read the diagnostic trouble codes (DTCs) stored in the car's computer. Auto parts stores often offer free code reading services.

2. Fix the problem: Once you know the code(s), you can address the mechanical or electrical issue causing the problem. This might involve replacing a sensor, fixing a leak, or performing other repairs.

3. Clear the code (after repair): *After* you've fixed the problem, you can then clear the code from the car's computer. This can be done with the same OBD-II scanner used for diagnosis. Many scanners have a "clear codes" function.

Warning: Simply clearing the code without addressing the underlying problem will only temporarily turn off the light. The problem will likely persist, and could lead to further damage to your vehicle.