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CHEVY CRUZE CHECK ENGINE LIGHT P2097 P0420 & P0324 DIAGNOSIS - YouTube
FIX CODE P0420 ON CHEVROLET CRUZE, CHEVY SONIC Catalyst System
P0420 Catalyst System Efficiency Below Threshold (Bank 1) | The Motor Guy
P0420 Chevy Cruze: Catalyst System Efficiency Below Threshold
P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) - In