05 Grand Marquis OBD-II Codes

[SGT_MERC]

My 05 GM goes into idle mode sometimes with the mechanics symbol lit in the dash cluster. I read the codes and the code reads 2106: Throttle position input out of range, high. What do I have to look at or have done to fix this. It's drive by wire. 3 other codes came up also.

2104: passenger door key cylinder switch failure
2112: driver door set switch stuck failure
2135: parking brake applied warning lamp circuit failure. The last couple of days, the e-brake does not disengage automatically when I put the car into drive.

What needs fixed on these 3 codes

Thank You in advance for the help, Marty

[RoyLPita]

Throttle body for the 2106 code.

[05crownsport]

Could it be a harness issue? Didn't you move it to install the p51 intake? Check it for rubs/abrasions. The door lock and parking brake codes could be related. Does your door lock when you put it in drive still? I figured that since both the parking brake disengages and the doors lock when put into gear, there must be a common activation switch somewhere. I'll look for a set of Ford manuals because inevitably I'll need them one day as well. Talk to you soon Marty.