How to Remove the Oxygen Sensor in a 2002 Jeep Grand 4.0L

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In 1993, Jeep upped the ante in the SUV market by releasing the Grand Cherokee, a more luxurious mid-sized SUV. The 2002 Grand Cherokee came standard with a 195-horsepower, 4.0-liter in-line six-cylinder engine. Being an in-line-six engine, federal emission regulations require just two oxygen sensors, one upstream and one downstream. Replacing the two oxygen sensors in a federal emission-compliant 2002 Jeep Grand Cherokee is a straightforward process, but it may require additional heat for those hard-to-remove sensors.

Things You'll Need

  • Floor jack
  • Jack stands
  • Ratchet
  • Oxygen sensor socket
  • Propane torch (optional)
  • Torque wrench

Upstream Sensor Removal – Bank 1, Sensor 1

  • Park the Grand Cherokee on a flat surface and allow it to sit until the engine is completely cool. Allow the vehicle to sit for an additional hour to let the exhaust pipes cool.

  • Lift the front of the Grand Cherokee with a floor jack and slide jack stands under the frame rails. Lower the SUV onto the frame rails.

  • Crawl under the front of the Jeep until you have a good view of the bottom of the down pipe – the pipe that bolts to the exhaust manifold. Find the upstream oxygen sensor screwed into the bottom of the exhaust manifold, near the front of the transmission.

  • Trace the sensor’s wiring until you reach where its harness connects to the Grand Cherokee’s harness. Unplug the oxygen sensor’s wiring harness from the Grand Cherokee’s wiring harness.

  • Unscrew the oxygen sensor from the exhaust down pipe, using a ratchet and oxygen sensor socket. If the sensor is seized, heat its base with a propane torch, then loosen it. Once the sensor cools, unscrew the sensor from the pipe.

Upstream Sensor Installation – Bank 1, Sensor 1

Downstream Sensor Removal – Bank 1, Sensor 2

  • Lift the front of the Grand Cherokee off the ground with a floor jack and position jack stands under its frame rails. Lower the vehicle onto the jack stands.

  • Position yourself under the vehicle, just behind the transmission and toward the passenger’s side. Find the catalytic converter, the muffler-like component attached to the exhaust pipe. Find the downstream oxygen sensor, which screws into the exhaust pipe right after the catalytic converter.

  • Trace the downstream oxygen sensor’s wiring upward until you find where it connects to the Grand Cherokee’s wiring harness. Unplug the oxygen sensor’s wiring harness from the Grand Cherokee’s harness.

  • Remove the oxygen sensor by unscrewing it from the exhaust pipe, using a ratchet and oxygen sensor socket. If the sensor is seized, heat its base with a propane torch, then loosen it. Allow the sensor to sit until it is cool, then continue removing it.

Downstream Sensor Installation – Bank 1, Sensor 2

  • Thread the new oxygen sensor into the exhaust pipe by hand, then tighten it to 22 foot-pounds with a torque wrench and oxygen sensor socket.

  • Connect the oxygen sensor’s wiring harness to the Grand Cherokee’s wiring harness.

  • Lift the SUV off of the jack stands and remove the stands. Lower the vehicle to the ground.

References

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