Experiencing vehicle emission test failures can be frustrating. For owners using Range Technology Active Fuel Management (AFM) disabler devices, there’s a crucial factor to consider. One truck owner recently encountered an unexpected issue during a routine state emission test after using a Range AFM disabler on their 2015 Sierra 2wd 4.3L V6. This personal account sheds light on a potential problem for users of such OBD2 devices.
The owner, preparing for a Missouri state emission test, disconnected their Range disabler before taking their truck to a local mechanic. Missouri’s test involves a direct OBDII port connection to assess emission sensors, without physical tailpipe checks. Surprisingly, the truck failed the “readiness” system test, specifically for the O2 sensor and catalytic converter, both marked as “not completed.” The mechanic inquired about recent battery replacements or code clearing, but neither had occurred.
This led the truck owner to question if the Range AFM disabler removal was related to the failure. Contacting Range Technology support confirmed this suspicion. Range Technology explicitly stated: “As of right now, the AFM disablers are not emissions approved and can cause the vehicle to fail.” They further clarified, “Disabling and then re-enabling the AFM system does reset the vehicle’s emissions readiness systems. We do recommend driving the vehicle for 50-100 total miles with the device removed to allow the emissions systems to fully reset before going to get the vehicle tested.“
This information highlights a critical point for anyone using Range Technology Obd2 devices, particularly AFM disablers, and requiring emission testing. Removing these devices can reset emission readiness monitors, essential for passing OBDII-based emission tests. If you use a Range AFM disabler or similar product, it’s advisable to remove it and drive your vehicle for 50-100 miles before your emission test to ensure all systems are properly reset and ready for inspection. This precaution can help avoid unexpected emission test failures and ensure your vehicle meets state requirements.
