Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM ORVAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS .
Engine must run at idle for this.
Check DTC Memory. See CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05) . There must not be any DTCs stored, repair malfunctions if necessary, erase DTC memory, switch engine off and start again, road test vehicle and check DTC memory again as a control measure.

Depending on desired operation:

When indicated on display:

Fig 1: Identifying VAG1551 Scan Tool Display - Basic Setting (1 Of 4)

Press buttons -0- and -4- to select "Initiate basic setting" and press - Q- button to confirm input.

When indicated on display:

Fig 2: Identifying VAG1551 Scan Tool Display - Basic Setting (2 Of 4)

Example:

Press buttons -0-, -0- and -0- to select "display group number 000" and press -Q- button to confirm input.

NOTE: After selecting this display group number, the EVAP valve is closed and A/C compressor switched off.

Indicated on display:

Fig 3: Identifying VAG1551 Scan Tool Display - Basic Setting (3 Of 4)

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Test sequence