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Old 11-30-2003, 08:00 PM   #1
Scooby Newbie
Member#: 47324
Join Date: Nov 2003
Default O2 Sensor readings

Hi everybody,

I have Subaru OB '97 with about 115K. I have never replaced Oxygen sensors and I'm wondered if I should just do it.

I'm having a pretty low MPG (~200-210 miles per 12 galons) for mixed city/highway driving. With "only highway" driving I'm getting 230-240 miles for 12 galons (i.e. 20MPG maximum).

Recently I have bought CarChip to check ECU readings and this is what I found:

1. From time to time I have 0.0V readings on the O2(B1,S1) sensor. It's not for long, sometimes for 10-15 seconds, but it's below 0.1V. I read in some technical manuals that you should never get readings below 0.1V on Oxygen Sensors.

2. My sensor never gives me readings above 0.8 Volt. And I'm getting 0.8V readings pretty rear. Most the time it's 0.1-0.6 which tells me my engine runs leaner it should be most of the time.

I read quite a few articles which say that for all cars from '96 and newer it's recomended to replace O2 sensors every 100K even without warning light from the computer. They tell that sensors may just become "weaker", but not enough to tell to ECU that it's "completely bad".

Any experience / thougths on this case?

Regards to everybody...
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Old 11-30-2003, 09:42 PM   #2
Scooby Guru
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
1990 Legacy & 97 OBS


it would probably help to replace the o2 sensor on your car.

You can get generic ones and splice them into your harness @ www.oxygensensors.com

as for the readings, they should bounce around a bit, and usually under full throttle acceleration is one of the few times you'll get a constant reading.
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