While there isn’t a single scanner specifically called a “car emissions scanner,” there are several tools used to diagnose emission-related problems and determine if a vehicle meets emissions standards. This article clarifies the tools and processes involved in emissions testing.
Understanding Emissions Testing and Diagnostic Tools
Vehicle emissions testing is crucial for environmental protection. A vehicle’s On-board Diagnostics system (OBDII) constantly monitors various components related to emissions. When a problem is detected, it triggers the Malfunction Indicator Lamp (MIL) – often referred to as the “check engine” light – and stores a Diagnostic Trouble Code (DTC) in the vehicle’s computer.
Mechanics use a scan tool, also known as an OBDII code reader or diagnostic scanner, to retrieve these DTCs. These scanners plug into the vehicle’s OBDII port and communicate with the computer to access stored codes and live data streams.
OBDII scanners vary in complexity and functionality. Basic code readers simply display the DTCs, while more advanced scan tools provide detailed information about the problem, including freeze frame data (a snapshot of the vehicle’s operating conditions when the code was set), live sensor readings, and the ability to perform various tests. These tools can help identify issues like a faulty oxygen sensor, a malfunctioning catalytic converter, or problems with the evaporative emissions system.
However, an OBDII scanner alone doesn’t directly measure emissions output. It identifies the underlying problems that could lead to increased emissions. To accurately measure tailpipe emissions, a dedicated emissions analyzer is used during official vehicle inspections. This equipment analyzes the composition of the exhaust gases to determine the levels of pollutants like hydrocarbons, carbon monoxide, and nitrogen oxides.
The Role of Recognized Emissions Repair Facilities (RERFs)
When a vehicle fails an emissions test or has a transmission-related DTC (which can indirectly affect emissions), diagnosing and repairing the issue correctly is essential. Recognized Emissions Repair Facilities (RERFs) and dealerships have specialized training and equipment to handle these complex repairs. They use advanced diagnostic tools, including both OBDII scanners and emissions analyzers, to pinpoint the problem and ensure the vehicle meets emissions standards after the repair.
Conclusion: Getting Your Car Emissions Tested
While a standard OBDII scanner can help identify potential emission problems, it does not definitively test car emissions. A professional emissions test using specialized equipment at a certified facility is necessary to determine if your vehicle meets required standards. If your car’s MIL is illuminated, consulting a qualified mechanic or an RERF is crucial for accurate diagnosis and repair. They have the expertise and the right tools to ensure your vehicle runs efficiently and meets environmental regulations.
