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.
Long Term Fuel Trim
The parameter displays the adaptation factor of the Ξ» probe.
Measurement range 0-2 Ξ»-adap.
Compensates the injection period at the relevant load so that the Ξ» value can be correctly reached.
Normal value 1.
There are 36 adaptation windows. Which window is active depends on the load and the engine speed.
Works together with "Lambda compensation".
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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