Okay so codes 21, 31, and 51
21 - I have a brand new o2 sensor
.....so im not sure there
31 - is the afm correct? Now I've read the FAQ section on adjusting. However when you say the screw has to be a certain distance you mean from the top of the screw to the top of the housing or ? I could use some more insight on this one.
Thanks guys
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