Modifications to OBD Vehicles
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Modifications or additions to the vehicle may cause incorrect operation of the OBD system. Non-factory anti-theft systems, cellular telephones, and radios must be carefully installed. Do not install these devices by tapping into or running wires close to the powertrain control system wires or components.