PO 420 Solved - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

 
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post #1 of 1 (permalink) Old 11-20-2015, 08:22 PM Thread Starter
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Join Date: Sep 2014
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PO 420 Solved

I tried to update a thread started earlier but unfortunately it`s since been closed. In any case, the cause of my issue turned out to be the catcon. The exhaust manifold was also replaced as it had a crack in it. That problem manifested itself as a ticking noise on cold start that would subside after a few seconds, I thought it was a leaking lifter.

https://www.yourcobalt.com/forums/pro...ml#post1270065
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