For vehicles with a digital oil life monitor:
1. Turn the ignition to the "ON" position (without starting the engine).
2. Locate the oil life monitor. This is usually displayed on the instrument cluster.
3. Use the trip odometer reset button or other control button (usually a small button near the steering wheel or on the instrument cluster). This button's function varies slightly depending on the specific Trailblazer model. You'll need to consult your owner's manual for the precise button. It might involve repeatedly pressing a button or holding it down for a few seconds while cycling through the various displays.
4. Look for a sequence to reset the oil life. Some systems require a specific sequence of button presses, indicated in your owner's manual. You may need to cycle through different menus on the display to find the oil life reset option.
5. Confirm the reset. Once you've found the right sequence, the oil life percentage should reset to 100% (or a similar indicator).
For vehicles with an analog oil life indicator (a light):
You likely *cannot* reset an analog indicator. The light illuminates when it's time for an oil change. Simply change the oil and the light should go out after you start and drive the vehicle.
If you're unsure:
* Consult your owner's manual: This is the most definitive source of information for your specific 2005 Trailblazer model. The steps can vary slightly.
* Search online for "2005 Chevrolet Trailblazer oil life reset" along with your specific trim level (LS, LT, etc.). This might provide videos or more detailed instructions from other owners.
Important Note: Resetting the oil life monitor is only a reminder. It's crucial to follow your recommended oil change interval based on your driving conditions and the type of oil you use, regardless of what the monitor shows. Ignoring the oil change recommendation can damage your engine.
