New to this forum and have an '07 Wrangler x - 3.8: V6. Had a multiitude of warning lights in dash all pointing to a bad O2 sensor bank 1sensor 1. Replaced and didn't eliminate the warning lights in dash. So I replaced the remianing 3 O2 sensors and then it threw a camshaft sensor position code so I replaced it also. It ran fine for about a week before the engine misfirine and sputtering returned. When i hook up the code reader now it is showing P2127 (accelator pedal position sensor) and PO652 Sensor Reference Voltage 2 circuit low code. Any ideas on the problem and solutions? As mentioned I replaced all of the O2 sensors, camshaft positions and MAP sensor.

 

Welcome to JKF. Sounds like a ground issue with the wiring harness somewhere. There are many ground point locations to check. Are you battery terminals clean and is the battery old or new?

 

Thanks. Battery terminals are clean and battery is fairly new, replaced it about 8 months ago. I’ll double check and clean the terminals again and begin check grounds.

 

Welcome; Checked into 2127-The voltage of the throttle position sensor can drop below the expected range for several reasons, including the following: A loosely-mounted throttle position sensor. Electrical short on the sensor circuit, either to the ground or to another wire. Faulty sensor.
AND this could be related to the 2127=https://www.obd-codes.com/p0652