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Anyone have an idea on why a 96 Accord LX would have two oxygen sensors in series. One by the headers and the other before the converter. I am a little confused since I believe the OBD II system is supposed to have the oxygen sensor before and after the catalytic converter.

The reason I ask is because I have a service engine light on because of my cheap after market converter. Not sure how this is possible since the converter is downstream of the sensor.

Any input is appreciated.
 
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