OBDII Diagnostic Trouble Codes (DTC’s)

OBDII, California’s second generation of OBD requirements, is a diagnostic system incorporated into the vehicle’s powertrain computer that is designed to assist in pollution reduction and prevention. The OBDII system monitors virtually every component and system that can affect emissions during normal driving, alerting the driver through a dashboard malfunction indicator light (MIL) and storing fault code information for technicians.

Manufacturers can only use the MIL for indication of emission related faults, and not for maintenance reminders, mileage intervals, or any other non-emission-related items. Generally, the OBDII system is required to illuminate the MIL after the same fault has been found in two different driving cycles, which helps to ovoid MIL illumination for random faults or abnormal conditions. The MIL is only allowed to extinguish when the same fault has not been detected on three successive driving cycles. Diagnostic Trouble Codes (DTCs) remain stored for around 40 driving cycles to make sure that information is still available to repair technicians even after the MIL is extinguished.

Below you will find links to meanings of the various trouble codes, both for Ford and other vehicles equipped with the second generation of On Board Diagnostic systems.

ModdedMustangs has taken down the data listed below as per SAE J2012 Copyright. If you wish to find the information, you can click here.

If you have a fault code and need assistance tracking down the problem, you may register and post your question in our forum. Don’t hesitate to ask a question, some of our members and staff are ASE certified and welcome the opportunity to help you solve your DTC issues.