Discussion
Which diagnostic reveals a misfiring cylinder on a modern engine?
Answer: B
The controller watches the crankshaft accelerate after each firing and identifies the cylinder that contributes nothing. Lambda sensors genuinely detect the resulting excess oxygen but cannot identify which cylinder on most engines. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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