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Sensors going bad without OBD-2

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  • Sensors going bad without OBD-2

    This might be a stupid question, but in a 1995 240sx with an SR, if an oxygen or whatever sensor goes bad, how would you know?

  • #2
    There are still diagnostics on the engine, it is just obd1. Your check engine lite will still light up when it senses that something is wrong with the o2
    "To an engineer, the glass is neither half empty nor half full. It is twice as big as it needs to be."
    '96 Nissan 240SX KA-T
    '05 Grand Cherokee


    • #3
      S13 Redtops will completely ignore it and basically run open loop on fuel corrections. I didn't have a working O2 sensor on my car for a while, and I felt it actually ran a bit better since I could lean cruise at 15.3-15.5 AFR vs. it bouncing below stoich then up to my target AFR 15.5 or so then back down again. It was a small but imperceptible change in engine response since it'd gain torque when going rich, then slack off when leaning out.
      '18 Chevrolet Volt - Electric fun hatch for DD duty!

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