The original Gear Team OBD-II scanners test this article is based on was written by associate editor Collin Morgan, who leads the Hearst Autos Gear Team based in Ann Arbor, Michigan. In the case of Bluetooth OBD-II scanners, some of their apps will also include links to video explainers pulled from YouTube that will show you how to further diagnose and even repair the faulty components responsible for the code. For some of the more advanced models, there's even a code lookup function that will further explain what the fault code is referring to and what might be causing it. Nearly all modern OBD-II scanners will summarize what the error code is alongside the five-character alphanumeric code. It can be any number between zero and 99. The fourth and fifth numbers denote the specific fault being detected. The third character is either a letter or number that specifies which of the vehicle systems is throwing a fault:Ġ: Fuel and air metering and auxiliary emissions controlsĢ: Fuel and air metering (specific injector circuit) 3: Ignition systems or misfiresĤ: Auxiliary emission controls 5: Vehicle speed control and idle control systems (Manufacturers reserve the right to generate their own codes if there isn't a generic code for a specific problem they'd like drivers/techs to be able to diagnose.) The second character is a number that specifies whether it's a generic OBD-II code or a manufacturer code. The letter denotes which of the four main systems the fault has been detected in: How do I know what problem a DTC has detected?Įach DTC (diagnostic trouble code) is made up of five characters: A single letter followed by four numbers. However, some specialized scanners may be required for specific vehicle makes and models. OBD-II scanners are compatible with most vehicles manufactured after 1996 (in the United States) and 2001 (in Europe) that adhere to OBD-II standards. Are OBD-II scanners compatible with all vehicles? They help identify problems by providing error codes and data that mechanics can use to diagnose and fix issues accurately. OBD-II scanners are diagnostic tools and not repair devices. Can OBD-II scanners fix issues in my vehicle? However, some advanced features might require a basic understanding of vehicle diagnostics. Most OBD-II scanners are designed to be user-friendly, with simple interfaces and clear instructions. However, some specialized scanners might offer additional features specific to these vehicle types. Yes, OBD-II scanners work with hybrid and electric vehicles as they also have OBD-II systems.
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