VAFC & O2 sensor
I got a CEL and my car is running rich right now. I think it's because of a bad O2 sensor. Well, if I install the VAFC, and set it so that I run a little leaner, do I still have to get a new O2 sensor?
If the sensor is bad, it's bad, and you need to look into getting a new one. With the VAFC, you can lean it a little to compensate, but a new 02 should be on your list.
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