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As an update, the CEL has stayed off for about 70 miles now (I barely drive) and I passed smog today with flying colors. All I did was pour a bottle of techron cleaner, clean the maf sensor, and replace some leaking spark plug tubes. I'm wondering if the oil from my leaking spark plug tubes caused incorrect o2 sensor readings.
Also for some reason, even though my Durametrics still showed that the secondary air system was not ready, I didn't fail any functional tests during the smog check.
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