Knock/Misfire (B207)
Description
Knocking occurs when fuel burns unevenly in your engine’s cylinders. When cylinders have the
correct balance of air and fuel, fuel will burn in small, regulated pockets instead of all at once. After
each pocket burns, it creates a little shock, igniting the next pocket and continuing the cycle. Engine
knocking happens when fuel burns unevenly and those shocks go off at the wrong time. The result is
an annoying noise and potential damage to your engine’s cylinder walls and pistons.
Misfire is the result of incomplete combustion (or zero combustion) inside one or more of an
engine's cylinders. And to the driver, the problem will usually feel like hesitation, shaking or jerking
when the car is running.
On B207 the counters show accumulated values since the Engine Control Module was last time reset
(battery disconnected)
Enable Criteria
B207 Engine
Units
Counts
User Inputs
SET – Resets the counters in the Engine Control Module.
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