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← ScienceWhich consequence can occur when a catalytic converter's substrate cracks?
A)Increased exhaust back pressure✓
B)Richer air-fuel mixture
C)Optimized engine timing
D)Reduced hydrocarbon emissions
💡 Explanation
Increased back pressure results because when the monolith structure cracks, it obstructs exhaust flow, raising pressure. This mechanical blockage from substrate failure is catalytic converter poisoning rather than a chemical imbalance or combustion benefit.
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