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Thanks. I do hope others can save some unnecessary trial and error- and money. After watching 30 or 40 you-tube videos, I luckily saw one where the guy used a shop vac to test for a leak, which is one thing that could cause the PO420. I would give them credit, but I don't remember the channel...

If you read my post up above, it says mine was fixed by welding the flex pipe leak- which was NOT EASILY visible. It is going on two months now, and the check engine light has not come back on. The muffler place read the code and immediately tried to sell me a new catalytic converter, but I had...

SEPT 14 2023: My daughter's 2016 Sonic LT 1.8 Just got the PO 420. It has about 38,000 miles. It is the only code that comes up. I put a shop vac on the tailpipe and went underneath to find an exhaust leak on the front of the flex pipe. Before I mess with the 02 sensors, I am going to fix the...