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Q: CEL on on 2004 Chevrolet Avalanche 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
blew out #1 fuel injector at about 50,000 miles now showing trouble code 0420 at 105,000 miles (o2 sensors or CAT)
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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