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What does catalyst efficiency below threshold mean on a Chevy Trailblazer?
Wiki User
∙ 9y ago
Damaged or failed oxygen sensor, engine coolant temperature sensor not working properly, damaged or leaking exhaust, retarded spark timing or the oxygen sensors in front and behind the converter are reporting too similar of readings. Leaking fuel injectors or high fuel pressure could also cause it.
Wiki User
∙ 9y ago
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