2007 Lincoln Navigator U0121, U0155, and U0101 Diagnostic Codes - No Check Engine Light, Strange Noise During Drive

Model: 2007 Lincoln Navigator Fault Code: U0101 Posted: 2019-08-18 21:12

My 2007 Lincoln Navigator is displaying diagnostic trouble codes U0121, U0155, and U0101. Currently, there is no check engine light on the dashboard. I replaced the AAA battery two days ago, but the vehicle still makes a loud, inconsistent noise while driving—occasionally, not always. The issue seems to be related to communication between the vehicle's modules or sensor malfunctions. Any insights or troubleshooting steps for these specific OBD2 codes in a 2007 Lincoln Navigator would be greatly appreciated.