Received code P0135 and B0298 on the scan tool. P0135 was O2 sensor on Bank 1. Replaced all four sensors (just in case) and the B0298 code is still appearing on the scanner. Check Engine light is still on. It is a 2003 GMC Yukon XL 1500 flex-fuel. B0298 appears as "powertrain control malfunction". Other than the check engine light staying on and the B0298 code, the truck runs strong.
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