Applicable Vehicles :
All Accessport Compatible Vehicles.
Problematic Aftermarket Electronics:
There are a variety of electronics which can cause interference between the Accessport and your vehicle. This can include anything which plugs into the OBDII port like a gauge or scanner, an Alarm or immobilizer system, and even an aftermarket stereo. Loose or dirty battery cables, a bad battery and non-resistor sparkplugs (which cause electronic interference with all electronics) have also proven to be an issue which can prevent your Accessport from connecting properly.
Replacement OBDII Cable
How to Update Firmware