General Information

The Motronic engine management system is equipped with built in diagnostics. Some of the faults will illuminate the "Check Engine" light, but many will not.

Diagnostic Trouble Codes (DTC) can be displayed in one of two ways:

^ By using the specialized Volkswagen Scan Tool (ST) VAG 1551. With Manufacturer's Scan Tool
^ By jumping the Data Link Connector (DLC) and interpreting blink codes through the Malfunction Indicator Light (MIL) in the instrument cluster. [1][2]Reading Diagnostic Trouble Codes

DTCs are accessed through the Data Link Connector(s). The connectors are behind a cover in the center of the dash, below the heating and ventilation controls.