Q: I have a check engine light on
My code is 0172, "right bank rich". I've change both O2 sensors, cleaned the MAF, installed new plugs and air filter, sprayed carb cleaner around the intake boots looking for a vacuum leak and found nothing. I don't suspect a hidden vacuum leak because this car idles smoother than anything else I own! Any suggestions? or keep looking for a vacuum leak?
My car has 210000 miles.
My car has an automatic transmission.
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