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I just ran the self-diagnostic on my newly acquired caddy after the service engine soon light came on. The description for E046 was "Right to Left Bank Fueling Difference", what should I check to replace?
 

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I should note that driveability and idling isn't any different than before it came on.
 

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It means, that one fuel injectors rail inject different amount of fuel.
I think you need clean those rails and maybe have injectors controlled.
I had same readings in last winter - i just add bottle of injector cleaner to gasoline, and it helps.
 
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