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  1. S

    Bank 1 & 2 O2 Sensor ‘03 4.0L

    Thank you all for the info. I don’t have access to a lift, so it might be an interesting job lol.
  2. S

    Bank 1 & 2 O2 Sensor ‘03 4.0L

    Hi everyone! I’m going to attempt to replace the O2 sensors on my sister-in-law’s ‘03 Explorer 4.0L. The dealership used a code reader and advised that the bank 1 & 2 O2 sensors were bad. I don’t have the code. I’m wondering if those are upstream sensors or downstream? Also, I have never...
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