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How to Replace the Oxygen Sensor on a 1989 Nissan Maxima

The 1989 model year brought a complete redesign of Nissans flagship sedan, the Maxima. Experts considered this version of the Maxima the most beautiful to date, and it was also significantly larger than previous models. The 1989 Maxima uses just one oxygen sensor to monitor the level of oxygen in the exhaust and send this information to the electronic control unit. The ECU then uses this information to adjust the air-to-fuel ratio in the combustion chamber to keep the Maxima at peak performance.

Instructions

Removal

1

Raise the front of the Maxima with a floor jack and slide jack stands under the vehicles subframe. Lower the Maxima onto the jack stands.

2

Crawl under the middle of the vehicle and find the front pipe, the exhaust pipe just before the catalytic converter. Find the oxygen sensor screwed into the front pipe, just before the catalytic converter.

3

Spray the base of the oxygen sensor with penetrating oil and allow it to sit for the time specified in the penetrating oil instructions.

4

Trace the oxygen sensors wiring upward until you find where the sensors wiring harness plugs into the Maximas wiring harness. Unplug the oxygen sensors wiring harness.

5

Remove the oxygen sensor from the front pipe, using a ratchet and oxygen sensor socket.

Installation

6

Apply a coating of anti-seize compound to the new oxygen sensors threads and hand-tighten the sensor into the front pipe.

7

Tighten the sensor to 15 foot-pounds using a torque wrench and oxygen sensor socket.

8

Apply a small amount of dielectric grease to the inside of the oxygen sensors wiring harness and plug the sensors harness into the Maximas wiring harness.

9

Raise the vehicle off the jack stands and remove the stands. Lower the vehicle to the ground.

Posted by Unknown at 4:45 PM

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