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Q:

check engen lite code0443 willnot clear on 2007 Chevrolet Cobalt

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replaced gas cap and purge slonoid
(1) Answer
then it could be:
wiring harness chafing or rubbing another component causing short or open on control circuit;
connector worn, broken or shorted due to water intrusion;
or driver circuit inside PCM is bad

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