Question about 1999 Subaru Impreza

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Were on exaust is oxygen sensor in 1999 subaru impreza auto sport

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On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine
were on exaust is oxygen sensor in 1999 subaru - c3fce0b.jpg

Oxygen sensor location-Baja 2.5L DOHC engine
7aac75e.jpg


On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 19were on exaust is oxygen sensor in 1999 subaru - a5973e4.jpgL engine
a5973e4.jpg


moz-screenshot.pngOxygen sensor location-Impreza 1998-2002 2.5L SOHC engine
3a84717.jpg
I hope helped with this; remember rated this help. Good luck.

Posted on Nov 20, 2009

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Buy the new sensor and it comes with instructions.
A bosch O2 sensor has a nice detail set of instructions for replacement.

Location varies with model of Subaru, but most are installed just upstream (towards the engine) from the catalytic converter located under the right hand drive shaft.

You must get under the car to replace. Make sure you follow safety and use a good set of car ramps on level solid ground to raise the car, or use jack stands. Best to work on a cool engine/car.

Unplug the wire leading from the O2 sensor, then unscrew the sensor to remove. The old one may be stuck quite well, but it unscrews like a spark plug.

When installing the new one, avoid getting dirt, grease (or anti-sieze) on the sensing tip of the new unit, and just screw back in. It will turn easily for a few turns, then turn harder for about 1/2 turn, then it just stops turning. You have compressed the sealing washer correctly.

Remove your wrench, plug the new sensor back in, and lower the car. Do not be surprised if the computer is a bit confused for the first 20 minutes of driving-- it will be re-learning the correct new oxygen sensor.

Posted on Nov 20, 2009

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The images posted are actually incorrectly labled.

see the following link for the correct ones.

http://www.autozone.com/autozone/repairguides/Subaru-Car-1998-05/Component-Locations/Heated-Oxygen-Sensor-H02S/_/P-0996b43f8037aa9c

Posted on Aug 18, 2012

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