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check engine

  1. E39 M5 and E52 Z8 Discussion
    I failed the emissions test to day and here are the Codes but my check engine light is not on could it be burnt out and how much would it matter to get a OEM sensor ?
  2. E34 M5 Discussion
    I've got a 91 US model and I recently started getting a flickering check engine light. I pulled the code, 1223, coolant temperature sensor. I also get an occasional moment where the water temp gauge drops to zero, then returns on its own. Given the random flickering of the CEL, I figured it...