Front drivers side sensor on crossover exaust pipe needs replaced. Note: use a socket made for oxogon sensors. Use anti seize if it's not on the new one when installing. After your done disconect neg. terminal of battery for 30sec. This should clear the code.
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P0137 = O2 sensor circuit low volts (bank 1 sensor 2). Could be a faulty B1 S2 O2 sensor.
Assuming you mean P0135, that would be O2 sensor heater circuit malfunction (bank 1 sensor 1). If the wiring to bank 1 sensor 1 is not damaged, it is probably a bad bank 1 sensor 1 O2 sensor. Replace it.
Trouble code P1320 means: Distributor Signal Interrupt
There are three 02 sensors. The front left sensor is the forward most sensor, on the left bank of the engine. The next is the front right sensor on the right bank, the rear sensor is after the catalytic convertor. see below web site: http://www.courtesyparts.com/A32_O2-sensors.html
where is the bank 1/sensor 2 O2 sensor on a dodge caravan...to the rear of the catalitic converter or to the engine (front) side of the converter?