Hey , im running an autometer a/f ratio guage on my b17a in my EK hatch. The problem is that the guage works exactly how it should for the first 15 minutes of highway driving (Ie: it moves back and forth, etc.) After about 15 minutes of driving, the guage always drops down to full lean and then quits working all together. My only guess is that i have a faulty o2 sensor? Thanks for your help!

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