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Guest Message by DevFuse
 

Photo
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Front 02 Sensor - 2001 Forester S


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4 replies to this topic

#1 BitBasher

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Posted 18 October 2005 - 10:27 AM

Hello All. I know that this topic has been pretty well hashed out over the years... well I guess it's not over yet!.
Anyway, my Forester seems to be running richer than it should and I suspect a lazy O2 sensor. No trouble codes show up, and no, I haven't done ay diagnostic tests. Trouble is, the front sensor on this one is a bit of an odd ball with a 6 lead cable. Can anyone shed some light on the workings of this sensor. The OEM unit is a little pricey, so I'd like to replace it with a universal sensor, but that doesn't seem possible. Any ideas?

#2 frag

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Posted 18 October 2005 - 11:13 AM

Hello All. I know that this topic has been pretty well hashed out over the years... well I guess it's not over yet!.
Anyway, my Forester seems to be running richer than it should and I suspect a lazy O2 sensor. No trouble codes show up, and no, I haven't done ay diagnostic tests. Trouble is, the front sensor on this one is a bit of an odd ball with a 6 lead cable. Can anyone shed some light on the workings of this sensor. The OEM unit is a little pricey, so I'd like to replace it with a universal sensor, but that doesn't seem possible. Any ideas?


Never seen or heard of more than four wires but I'm ready to learn.

#3 BitBasher

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Posted 18 October 2005 - 11:32 AM

OK... I've got some more info on this.
It's a Wideband O2 sensor, Bosch LSU4. Generically known as a 5 wire pump cell sensor. (the 6th wire stubs at a calibration resistor in the connector. 5 wires go to the sensor). Details are here http://wbo2.com/lsu/default.htm.

It ..appears.. that the sensor used on VW Jettas and Golfs, VW p/n 021-906-262-B. may be a suitable replacement, at half the cost of the Sub. OEM unit. (available at http://www.worldimpe...html?sku=117395 ) I'll have to dig in to it a little further.

#4 Subie Gal

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Posted 18 October 2005 - 12:03 PM

when dealing with electrical & sensors

OEM really is best.

the part you are referring to is only $68.69 for Genuine OEM

where? ;)
here.... https://www.subaruge..._parts_cat.html

use part number: 22791AA00A

contact me with questions
i'm the internet manager for SubaruGenuineparts...

Jamie

#5 friendly_jacek

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Posted 19 October 2005 - 06:35 AM

OEM is the way to go; this is a good price, I paid $156 a year ago or so.
However, based on my experience I would not be rushing to replace the sensor. Slow sensors was a big deal with OBD1 systems (pre 1996). Hoever, OBD2 was designed to diagnose bad sensors and catalists very well; so well that many states abandoned exhast testing. I replaced mine in 00 legacy with no results. You might want to look at your fuel pressure. Mine is on a high side, even AFTER I replaced a fuel pressure regulator (OEM).
Incidentally, I used Subie Gal's service. Highly recommended.

Edit: why you are saying rich? what is your LTFT?




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