Codes P0301 P0223 P0122 P02135

Originally Posted by Ozarks Driver

Looking for a place to start. I have read several throttle position sensor threads without finding what I am looking for, possibly because my search skills are poor.

I was driving in city traffic a couple of days ago when my 2010 370 with 105,00 miles developed a dead miss. I already had the plugs as it was due for them to be changed and at first I thought a plug had given up the ghost. I installed the plugs, and all were ready for replacement but showed only normal wear. I moved the throttle bodies out of the way with the wiring connected and do not believe I put excessive force on the harness. When I restarted the engine the miss was still present. I scanned the system and found P0301 (misfire cylinder 1), P0223 (throttle/pedal position sensor/switch B circuit high input), P0122 (throttle position sensor A circuit low input),and P2135 (throttle/pedal position sensor/switch A/B voltage correlation).

I replaced the coil this morning and eliminated the miss, the engine is idling very smoothly. When I press the accelerator the RPM's go to 1200 and then drop back to 1,000. I did/attempted the throttle position sensor reset (ignition to run without starting the engine and fully depress the pedal fully 5 times in less than 5 seconds) with no success. The battery has been disconnected several times for 30 minutes to over an hour in the course of work.

Where are some places to check and what might I have done to cause this problem? Both throttle body plugs seem to have tight connections, no corrosion, and have dielectric grease in them. Are there any connectors in the harness I might have pulled loose? The wires I can see without unwrapping show no visible cracks or other damage. Everything is stock. Thanks in advance.