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← ScienceWhich outcome results when a catalytic converter substrate plugs?
A)Increased upstream exhaust backpressure occurs✓
B)Fuel-air mixture leans excessively
C)Oxidation catalyst function improves
D)Engine compression ratio steadily decreases
💡 Explanation
Increased upstream backpressure occurs because restriction reduces flow into the converter which relies on *mass transport limitation*, therefore forcing build-up, rather than reducing conversion efficiency or affecting engine parameters.
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