I am using an inovate LM1 air/fuel meter but it has an error code 4 pump open. The instructions say to check the cable and do a heater recalibration, which I have done.

Still the same error code 4, pump open. So I am thinking of replacing the O2 sensor. Is there commonly available sensor that I could pick up at a parts store rather than order one from inovate ? Or a better solution than replacing the O2 sensor? Thanks, Joel

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