Discussion
Which fault does a seized secondary air valve produce?
Answer: B
The controller monitors the effect of the pump and logs a code when it does not appear. A leaking valve genuinely skews the oxygen sensor and drives the trims rich, which makes the last option a real secondary fault of the same system. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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