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02 pros and cons

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    #1

    02 pros and cons

    whats the pros and cons on disabling the o2 sensor on a p28 for a jdm h22
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    #2
    Pros - no limp-mode-inducing CEL when the o2 sensor fails or reads incorrectly. You don't have to buy a $40 replacement part.

    Cons - Your engine is running on a pre-set fuel map, and it has no idea what's actually happening inside your engine. The o2 sensor's purpose is to tell the ECU if the engine is running rich or lean, so it can adjust the amount of fuel to send. Without it, it sends fuel blindly. Due to a number of factors, such as the function of mechanical parts (injectors, piston rings, etc...), temperature, atmospheric conditions... an engine's fuel requirements could change. Without o2 sensor feedback, such a change could result in damage, or total failure.






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      #3
      CONS:
      Deev is right that something could go wrong and potentially result in a lean condition (especially on an older modified car) - but the ECU will not be aware of this lean condition and there will be no CEL to tell you that you are putting excessive wear on your engine.

      PROS:
      If you know what you are doing, you can tune your fuel map much leaner for cruising conditions and get better fuel economy. However, lean mixture produces higher emissions and I believe (correct me if I am wrong) it could potentially damage your catalytic converter.



      I disable the O2 sensor on all my cars that I tune myself. I am a pretty mediocre tuner but I've been able to get very consistent air-fuel ratios in open loop. But I do run a wideband sensor with a gauge at all times just so I can see what is going on.

      I'd say if you are running a wideband gauge and your engine is heavily modded, and your partial throttle is tuned very well, then there is probably no need for a narrow-band oxygen sensor.

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