Question…

I only have 2 Oxygen Sensors in this vehicle. One Upstream and one Downstream.

If I were to change the Upstream should I change the Downstream as well??

Why I’m changing my upstream you ask??

I am seeing noticeable affects off the vehicle running rich. Too much gas consumption than normal

  • prov3rbzOPB
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    11 months ago

    I changed all the sparkplugs already :/ the problem persists