Was looking online, and with LT's the code P2626 was on one side. The suggestion was to switch sensors and see if the code follows. The car in question turned out to be a bad O2 extension.
Are you using a mail order tune with TB and longtubes? No way I would trust that. I'd give HPP a call and ask them for help if you can't get it figured out.
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2013 Ford Explorer
2008 Shelby GT500
600rwhp 550rwtq - 93 Octane Tune
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