Have not had any reverse lights for a couple of months. First I checked the bulbs, they both where fine. Finally got around to checking the transmission range sensor. While in reverse, the black/pink wire has 12vdc on it. Back to the connector behind the bumper, C421 IIRC. Nothing on the black/pink wire. Connector C311, located on crossmember behind transmission, ended up being not secure.

I was putting up with two DTC codes for a while. P0446 and P0453. Emission related and no driveability issues. Securing C311 also fixed that.

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2005 XLT 4.0 4x4 Automatic 5R55E 4 door
Avg. mpg: 18.2 Best mpg: 19.76