Quote:
Originally Posted by MDRex
You use it to lift the O2 sensor out of the exhaust path in the downpipe. This is done to change the reading of the sensor and prevent the car from throwing a cat inefficiency CEL.
They are originally meant to be used to prevent fouling of the spark plug, but it has nothing to do with the spark plugs in this usage. Hope this helps.
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Is this approach 100% effective? Would O2 sensor alerts be prevented, even without the Cobb AP or BMS JB4 tune, when visiting a dealership for example, with tune removed?