How do I know if my upstream or downstream oxygen sensor is bad?

What are the symptoms of a bad downstream oxygen sensor?

  1. A Glowing Check Engine Light. The bright orange Check Engine light in your dashboard will usually glow if you have a bad oxygen sensor.
  2. Bad Gas Mileage.
  3. An Engine That Sounds Rough.
  4. An Emissions Test Failure.
  5. An Older Vehicle.

Jan 18, 2021

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