I had a 1128 and 1130 error code and followed the advice of several posts and found that the oil filler cap was difficult to remove when running. I also heard an air leak after removing the rear engine cover. There were also a couple of instances of a lot of smoke coming from the exhaust at start-up only. So I changed the oil air separator and the CEL has stayed off since. The idle has improved and so has the gas milage.
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