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  1. Racefiend

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    It's not looking good....
  2. Racefiend

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    So a leak upstream or near any oxygen sensor is going to cause it to read leaner than normal, as outside oxygen will get pulled into the exhaust through the leak and cause the sensor reading to be skewed. Your video shows the rear O2 sensor sweeping between at least .2 and .8 volts. I would not...
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