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Old 02-09-2002, 07:14 PM   #1
Girl'sRS
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Member#: 162
Join Date: Aug 1999
Location: Phila, PA
Vehicle:
1999 Impreza RS
Silverthorne Metallic

Default bad O2 sensor on MY99

I have been reading old posts about failed O2 sensors, but it looks like a majority of them were on MY00s. I have 38,8** mi on my MY 99 and just got one of those REALLY $$$ car washes.. $91 to read the OBDII code. Has anyone else with a MY99 RS had an O2 sensor fail with a stock engine & exhaust?

Also, my fiance and I are going to replace the sensor ourselves.. (Ordered a new one on subaruparts.com for $97) anything to look out for? I was reading some old posts and there was some disucssion on weather the exhaust pipe should be warm or cold during the install.. Any info would be appreciated. Thanks!
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Old 02-10-2002, 12:49 AM   #2
Jon [in CT]
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02 WRX Sedan
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The exhaust pipe should be cold. You should apply some penetrating oil to the old sensor's threads before attempting to remove it. Give the oil at least a few minutes to do its work. If you don't want to buy a special O2 sensor socket with a slot in it for the wires, just cut off the old sensor's wires and use a deep 6 point socket, preferably 22mm but 7/8" will work. You're likely to find that the old sensor seems to be almost welded into the pipe, so you may need a breaker bar. Apply some anti-seize compound to the threads of the new sensor, but be real careful not to get any on the sensor itself. Tighten it to about 15 ft-lbs of torque with a box wrench.

Wow. $91 to read the code. You can buy a code scanner that runs on a PC for less than that.
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Old 02-10-2002, 01:12 PM   #3
Richard L.
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Join Date: Jul 2001
Chapter/Region: NWIC
Location: Puget Sound, WA
Vehicle:
'00 2.5RS Coupe, AW
'93 GMC Typhoon AWD

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According to most service manuals, the O2 sensor should be removed and installed when the exhaust pipe is warm. Here is an excerpt from the Haynes Repair Manual:
Quote:
Note: Because it is installed in the exhaust manifold or pipe, which contracts when cool, the oxygen sensor may be very difficult to loosen when the engine is cold. Rather than risk damage to the sensor (assuming you are planning to reuse it in another manifold or pipe) or the threads which it screws into, start and run the engine for a minute or two, then shut it off.
I have loosen the O2 sensors in my other cars before, and believe me, they were much easier to remove when the exhaust pipe was hot.
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Old 02-10-2002, 01:35 PM   #4
Girl'sRS
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Member#: 162
Join Date: Aug 1999
Location: Phila, PA
Vehicle:
1999 Impreza RS
Silverthorne Metallic

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Yeah, after this one I am going to get an OBDII reader.. anyone have any suggestions? There are a few models out there....

The other thing that bugs me is that the sensor died @ 38K.. why do these things die so fast?
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Old 02-10-2002, 02:01 PM   #5
Jon [in CT]
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Well, here's what the 2002 Impreza factory service manual says for the rear sensor, and it has a similar warning about the front sensor:
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Old 02-12-2002, 12:51 PM   #6
steppin16
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so how did everything go? I also have a 99 with a bad o2 sensor and have to replace it. I called the dealer and its $130 so ill try subaruparts.com and see if i can get it. can ya let me know any problems that u had that i can steer away from! thanks.
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