Where do I locate bank 1 sensor 1 in a 2004 Chrysler pacifica?

Answer 1

I assume you are referring to the Heated oxygen sensor (HO2s). You access it from under the car. It is located within a few inches of the rear exhaust manifold. Its electrical plug is secured right next to the rear HO2s electrical plug. The front HO2s electrical sensor plug is black. The rear one is white. A side note: Only use the OEM Denso brand sensors on these cars, Also, check the heater circuit in the sensor before installation (the 2 black wires). It must be between 2.1-2.7 ohms. Many aftermarket sensors won't meet this spec and will throw a DTC for HO2s heater failure. Trust me on this one. I just recently repaired a Pacifica. A new Bosch and a new Delphi sensor both failed the heater test, miserably. Anyway, if your car is front wheel drive only, access is super easy. AWD is a little more difficult. Good Luck! MGL