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Front heated O2 sensor no inversion. It means that the signal isn't increasing like it should. Most likely the O2 sensor is bad. It could also be a short or that the wires aren't plugged in all the way. Another possibility is that the PCM isn't getting vacuum signal.
i got a 1997 madza protege 1.5L and i was wondering if i could fit a 2003 madza 3 2.0L engine into it cuz i need more power can someone answer this for me plz asap???
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