Here's what you should do:
1. Identify the Problem: The light itself doesn't tell you *what* is wrong. You need to get the diagnostic trouble codes (DTCs) read. You can do this in a few ways:
* OBD-II Scanner: Purchase a relatively inexpensive OBD-II scanner (available at most auto parts stores). Plug it into the OBD-II port (usually under the dashboard) and it will read the codes. Many scanners will even give you a description of the code.
* Volvo Dealer or Independent Mechanic: Take your XC90 to a Volvo dealership or a reputable independent mechanic specializing in Volvos. They have professional diagnostic tools that can read the codes and pinpoint the problem much more accurately. This is the recommended approach.
2. Address the Problem: Once you know the code(s), you (or a mechanic) can address the underlying issue. This might involve replacing a sensor, fixing a leak, or performing more extensive repairs.
3. The Light Will Reset Itself: After the problem is fixed and the system is running correctly, the service engine light will usually reset itself after a few driving cycles (start-stop sequences). Some scanners also have the ability to clear codes, but this should only be done *after* the problem has been resolved.
Do NOT attempt to reset the light before fixing the problem. This will only mask the issue, which could lead to further damage or safety concerns. The light is there to alert you to a potential problem – ignoring it is unwise.
In short: Focus on fixing the problem, not resetting the light. The light will go out on its own once the problem is solved.
