Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Check the voltages at the bank 1 downstream O2 sensor. The Brown/White wire is the heater power while the motor is running, you should get 12 volts at start-up and then slowly drop as the sensor gets hot. Next, the Black/Dark Blue wire is the heater ground circuit and the Brown/Dark Green wire is the sensor ground wire. They should both show less than 50 mV while the motor is running and back probed at the connector. Last, check the Dark Blue/Yellow signal wire, this wire will have as high 5 volt when the sensor is cold. When the motor is started the voltage should drop rapidly to no more than 3.7 volts in about 30 seconds. Once the motor has reached operating temperature and/or "closed loop" the signal should be around 3.0 volts.
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I was looking at the wrong sensor colors. At bank one sensor 1. The ground is black/light green. The heater power is brown/light green. Check at the sensor for both of these when the key is on. If your missing the power then check it at the PCM.
You would push a pen in beside the PCM connector at this wire. Then test the voltage on that pen.