There was a TSB issued for this.
TSB 05-14-4
07/25/05
WRENCH LIGHT ON WITH BOTH DTC P2106 AND
P2135 - VEHICLES BUILT 11/29/2004 AND PRIOR
FORD:
2003-2005 Thunderbird
2005 Crown Victoria, Mustang
2004-2005 Explorer, F-150
2005 E-Series, Expedition, F-Super Duty
LINCOLN:
2003-2005 LS
2005 Town Car, Navigator
MERCURY:
2005 Grand Marquis
2004-2005 Mountaineer
This article supersedes TSB 05-09-15 to update the Issue and Dealer Coding.
ISSUE
Some vehicles built 11/29/2004 and prior may exhibit the wrench light on with both P2106 and P2135 diagnostic trouble codes (DTCs).
ACTION
Replace the throttle position sensor (TPS) following the instruction sheet included in the TPS service kit. Reprogram the powertrain control module (PCM) to the latest calibration using WDS release B36.11 and higher, or B37.2 and higher. This new calibration is not included in the B37 CD. Calibration files are also available at the website.
CAUTION FAILURE TO FOLLOW THE TPS REMOVAL AND INSTALLATION PROCEDURE WILL RESULT IN DAMAGE TO THE TPS SCREWS.