Oxygen Sensor Circuit Diagram (1994 3.0L Ford Ranger And Mazda B3000)

This typical circuit diagram of the oxygen sensors applies to the 1994 3.0L V6 Ford Ranger and 1994 3.0L V6 Mazda B3000.

Sensor #1 measure the oxygen content of the exhaust of engine cylinders 1, 2, and 3 (bank 1). Sensor #2 measures the exhaust of engine cylinders 4, 5, and 6 (bank 2).

O2 Sensor #1 Connector Pin-Out

Front View Of Engine Wiring Harness O2 Connector Of Bank 1 O2 Sensor. Oxygen Sensor Circuit Diagram (1994 3.0L Ford Ranger And Mazda B3000)
Pin Wire Color Description
1 LT BLU/ORG Heater 12 Volts
2 BLK or BLK/WHT Heater Ground
3 ORG Sensor Ground
4 GRY/LT BLU O2 Signal

Oxygen sensor #1 is located on the right side (passenger side) of the engine. It measures the O2 content of the exhaust of bank 1 of the engine. Bank 1 houses cylinders 1, 2, and 3.

You can find the O2 sensor #1 heater element test here: O2 Sensor #1 Heater Element Test (1994 3.0L Ford Ranger And Mazda B3000).

O2 Sensor #2 Connector Pin-Out

Front View Of Engine Wiring Harness O2 Connector Of Bank 2 O2 Sensor. Oxygen Sensor Circuit Diagram (1994 3.0L Ford Ranger And Mazda B3000)
Pin Wire Color Description
1 LT BLU/ORG Heater 12 Volts
2 BLK or BLK/WHT Heater Ground
3 ORG Sensor Ground
4 RED/BLK O2 Signal

Oxygen sensor #2 is located on the left side (driver side) of the engine. It measures the O2 content of the exhaust of bank 2 of the engine. Bank 2 houses cylinders 4, 5, and 6.

You can find the O2 sensor #2 heater element test here: O2 Sensor #2 Heater Element Test (1994 3.0L Ford Ranger And Mazda B3000).

More 3.0L Ford Ranger Tutorials

You can find a complete list of 3.0L Ford Ranger tutorials in this index:

  1. Ford 3.0L Index of Articles.

Here's a small sample of the tutorials you'll find in the index:

  1. Tune Up And Torque Specifications 1991-1994 3.0L Ford Ranger.
  2. How To Test The TPS (1993-1994 3.0L Ford Ranger).
  3. How To Test The Fuel Injectors (1992-1994 3.0L Ford Ranger).
  4. How To Test The Fuel Pump (1992-2000 3.0L Ford Ranger) (at: troubleshootmyvehicle.com).
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