ASE X1 Practice Questions - ASE X1 Exhaust Systems Specialist Certification Test Exam

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A vehicle is presented with a P0420 set and a customer complaint of failed state emissions inspection. Before condemning the catalytic converter, which of the following MUST be ruled out first?

Exhaust leaks upstream of the rear oxygen sensor and base-engine misfire Worn engine mounts An open-circuit horn relay Faulty tire pressure monitoring sensors

Correct Answer:

Exhaust leaks upstream of the rear oxygen sensor and base-engine misfire

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