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It is the sensor that is screwed into the exhaust manifold on the back of the engine.
It should be in the heater blower motor case which is located under the glovebox.
under the glove compartment I was told!
yes
No cable, all controls are done with electric motors.
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
It'll have an HVAC compartment which contains the heater core, blower fan, and AC evaporator. It'll be located (or partially located) under the dash next to the passenger door AC vent.
If it is saying that the heater circuit has failed then this O2 sensor has failed. The o2 sensors have tip heaters in them. These are irreplaceable. Replace the whole sensor. This particular sensor is located on the driver's side exhaust in front of the Catalytic Convertor.
The Dodge Caravan heater was invented in 1984 by the Dodge and Mopar companies. Since it's creation it has evolved into a much bigger and popular van.
Environment Circuit
heater sensor circuit Chevy astro 2000
In short, they dont have them as standard. You may have an aftermarket one fitted, which could be either a water circuit heater or diesel fuelled air heater, but nothing is guaranteed.