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Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

Catalyst efficiency below threshold

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Old Mar 18, 2018 | 11:33 AM
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cry_elliott
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Default Catalyst efficiency below threshold
New cat and new o2 sensors and still have an enigine light with error of catalyst efficiency below threshold. How can this be?
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Old Mar 18, 2018 | 7:56 PM
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tech2
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so you cleared the codes with a scan tool and the test ran and failed.
did you buy a quality cat or a cheap weld in cat?
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