Discussion
Lambda readings of \( 0.97 \), \( 1.00 \) and \( 1.03 \) are compared. Which lies within a typical three-way catalyst window of plus or minus one per cent?
Answer: B
A window of one per cent admits values from 0.99 to 1.01, so only the stoichiometric reading qualifies. It is a remarkably narrow band, and holding the engine within it is precisely what the closed loop fuelling system exists to do.
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