I had posted before about changing my O2 sensor on a 97 Subaru Legacy wagon with an OEM sensor and the check engine light came back. I received great responses (Thanks : ) One of them was to multi meter the wire coming from the engine side of the bank one sensor two oxygen sensor which sits right on the catalytic converter. I multi metered the wire using a positive and the negative with the ignition on engine off. There where three wires, two positive and one negative. I got a 10 ohm reading from one positive and no pulse from the other. Could this be the problem?
It sounds like the cats.
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