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CharlieRST
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CharlieRST's post in Error codes, engine running rough, check engine blinking.... was marked as the answer
P0306 is misfire on Cylinder 6, Bank 2 ( engine's left side, second cylinder back from front of engine.)
If the coil connector is loose, you can get misfire. The mis-fire causes the O2 sensor to get 'bad exhaust' out of the cylinder and causes the fault code for mixture before primary catalytic converter 'bank 2'.
If the connector on the coil is secure, and if the coil is okay, ( and if the spark plug is okay... probably) then the mis-fire could be caused by a vacuum leak on cylinder 6. I believe the air plenum is removed to change the thermostat. It's been known to happen that the gasket between the air plenum and the head can fall out of place as the air plenum is lowered in place... or the gasket can catch on the clips of the fuel injectors as the air plenum is lowered in place.. and tear the gasket. Either of these would allow an air leak/vacuum leak.
The description written in the lead of the thread for 0306 doesn't fit P0306.
The fault code involving valve lift for cylinder 6 doesn't fit the pattern of the other 2. Could the description associated with 1352 be incorrect too?
Check for ignition problem or vacuum leak.. fix it and then clear the codes and try it to see if anything returns.