MasterTuning Fault code dictionary (DTC)

B1420 — Idle speed increase

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: Mercedes-Benz
MeaningIdle speed increase.
FamilyBody (B)

Frequently asked questions

What does code B1420 mean?

Idle speed increase. Idle speed increase.

Can I keep driving with code B1420 active?

With caution: limp mode possible, have it checked soon

How do you fix code B1420?

Diagnosis starts from reading the live ECU parameters: the code points to the fault area, not to the part to replace. A vehicle-electronics specialist can test the component and clear the code after the repair.

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Where to get it fixed

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