I like knowing what I'm working with and my car is mostly not stock. I have three cars, but the one I am working on is an 03 Hyundai Elantra. What I want to do is reflash the ecu. Which is something I know almost nothing about. It's obdII and the scanner says kwp2000 when I hook it up. Just a code reader. It keeps throwing the oxygen sensor codes. I wouldn't mind disabling the second sensor since I don't have any cats in the exhaust and it's just complaining the whole time.

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