Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Performance/Speedometer Test
Disconnecting Electronic Stability Program (ESP), Acceleration Slip Regulation (ASR), Electronic Traction Stability (ETS), Anti-lock Brake System (ABS) control modules is not allowed. The Engine Control Module (ECM) and Transmission Control Module (TCM) rely on these modules for Vehicle Speed Sensor (VSS) data through the Controller Area Network (CAN) bus. To disable brake and engine regulation functions of the ESP, ASR, ETS, ABS control modules, perform one of the following procedures:
- Working without scan tool: turn ignition off, connect Adapter (140 589 14 63 00) to underhood Data Link Connector (DLC), jumper adapter sockets No. 1 and 6, start engine, BAS/ESP or BAS/ASR lights must illuminate. Erase DTCs after completing work.
- Using scan tool: turn ignition off, disconnect front axle Vehicle Speed Sensor (VSS) connector, ESP/ASR light must illuminate. When diagnostic/repair work is completed, reconnect VSS connector. Erase DTCs after completing work.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.