How to Buy a Code Scanner

Engine diagnostics, ABS Brakes and TPMS all have trouble lights on a dash.

Buying a diagnostic code scanner depends largely on what you plan on using it for. There are scanners for On-Board Diagnostics, ABS brakes, TPMS sensors, and more. The more you are willing to pay, you will get higher functionality from the scanner.

Engine Diagnostics

Cars manufactured after 1996 have to be compliant with On-Board Diagnostics. This means most cars sold in the United States use the same diagnostic system. Vehicles before 1996 all have separate systems and you will have to shop a little more carefully, keeping the manufacturer in mind. A scanner for 1989 Fords will not work in Toyotas of the same year. OBD-II scanners will not work on OBD-I vehicles.

ABS Brakes

The ABS braking system is separate from the OBD-II system, and it has its own trouble indicator light on the dashboard, as well as a set of trouble codes. Many scanners for use in current vehicles do not have the longer backward reach of OBD-II diagnostics. Shopping for a brakes diagnostic scanner requires researching ahead, keeping in mind the make and model of the vehicle it will be used on.

Tire Pressure Monitoring Systems

According to the Department of Transportation, all cars and light trucks after 2008 have to come with a tire pressure monitoring system. Similar to ABS brakes, this also means a separate trouble indicator light on the dashboard. The market for diagnostic scanners is largely dominated by OBD-II devices, and TPMS diagnostics is a relatively new system.

References

• Innova: Digital OBD II Code Reader Users Manual
• Actron: CP9449 ABS Brake Scan
• SPX Corp: Tire Pressure Monitor System (TPMS) Scan Tool Quick Start Guide

Resources

• US DOT: Motor Carrier Vehicle Safety Standards
• US EPA: Basic Information