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02 sensor.coolant

  1. P0420 Code

    Problems and Service
    this has been the year of codes for me. evap and 02 sensores and now cat issues. on 2 cars. i have a 06 2.2 auto cobalt 125k on it. and this code came up p0420 and i ran a ton of tests using the HF scanner. the cat runs at 700 rpm 900 deg at 4k 1200 deg. i did an ir temp and in front of cat...
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