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How do you know if the 0/2 sensor is working?

834 views 3 replies 3 participants last post by  Ranger 
G
#1 ·
Is there a code for it?
There is, isn't there?
I've never seen one set a code..
And I don't think there was an alert when I drove without one for a couple days

How do I know for sure it's working?
 
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