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Sounds like the exhaust flap perhaps? You can buy a healtec dongle to eliminate it. Why it has 3 error codes I don’t know. The only things that coudl be classed as “emissions controls” are:
1. PAIR - Secondary air injection to cylinder head
2. Exhaust flap
3. O2 sensors on pipe

Am I missing anything else?

The exhaust flap is a mechanical thing. I wonder if a shock could have caused an issue.
 
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