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.
Engine torque regulation
Engine torque regulation takes place after bus communication with the engine control module. The ESP control module requests an engine torque between -100 and +400 Nm. This is achieved through ignition retardation and throttle control, i.e. by changing the throttle angle and the boost pressure (air mass/combustion). Using engine torque regulation means that the brakes need not be applied as often, resulting in a higher degree of comfort.
These actions mean that kinetic energy in the drive wheels is converted into heat in both cases. Applying the brakes heats the wheel brakes and ignition retardation increases the exhaust temperature. Ignition retardation is not allowed at high exhaust temperatures to protect the turbocharger and catalytic converter.
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.