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Hello All,
I am new to the forum. I have a 2004 VW Jetta with 2.0L engine. Recently the ck eng light came on and when I use my OBD scan tool it says TOO LEAN OFF IDLE-BANK 1. I have thus far ran 2 bottles of high-quality injector cleaner, changed the fuel filter, and engine coolant temp sensor. The car has approx 97K. I do have a shop manual for it and btwn my father and I if the problem is mechanical we can generally tackle it, if we know where to start lol.

What could be causing this OBD code and what are your suggestions for repair?
 
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