Can you bypass an O2 sensor? You can bypass an O2 sensor as long as we’re talking about the post-cat O2 sensor. When people ask this question it’s usually because they’re getting a P0420 or P0430 catalytic converter code and they want to pass an emission test without replacing the cat converter. To do that, they want the post-cat sensor to show a flat waveform to the ECM. Using a spacer to bypass O2 sensor To accomplish that, many people “bypass” the O2 sensor by installing an O2 spacer that … Read More
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