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Old 07-02-2009, 10:57 PM   #1 (permalink)
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Default oxygen sensor front and rear

Hi
I need information which oxygen sensor should i buy for forester 2.5 N/A 2005 US. I would like buy universal replacement if there exists. :)
Can anyone help me??
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Old 07-03-2009, 05:25 AM   #2 (permalink)
 
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Originally Posted by pmlody View Post
Hi
I need information which oxygen sensor should i buy for forester 2.5 N/A 2005 US. I would like buy universal replacement if there exists. :)
Can anyone help me??
What code did it throw?
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Old 07-03-2009, 05:31 AM   #3 (permalink)
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P2097 but it isn't oxygen sensor problem. Exhaust gas analysis is correct, so ECU provide correct engine parameters. My question is for future possible needs... :)
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Old 07-03-2009, 05:44 AM   #4 (permalink)
 
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P2097 but it isn't oxygen sensor problem. Exhaust gas analysis is correct, so ECU provide correct engine parameters. My question is for future possible needs... :)
Universal replacements can be a PITA, I wouldn't advise it. Get direct fit (OE fit) from your local parts store instead of the dealer if they cost too much.
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Old 07-03-2009, 07:02 AM   #5 (permalink)
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The universal ones,they have them, people have had mixed results using them though. Bosch makes universal sensors you can get at most any local auto store. Getting the OEM part on line is a good idea. I've had luck here too:

2005 Subaru Forester Oxygen Sensor | Drivewire.com

I suggest you get the plug and play one though because sometimes the universal ones end up throwing the code again for some reason.
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Old 07-03-2009, 07:35 AM   #6 (permalink)
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The front O2 sensor (A/F - Air/Fuel) is critical for correct engine operation, so I would get an OEM/factory replacement for this one. The rear O2 sensor is used to monitor the efficiency of the CAT, so for this one, you could try a universal replacement sensor.

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Old 07-03-2009, 09:22 AM   #7 (permalink)
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BTW OEM, at one time at least, was/is Bosch.
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Old 07-03-2009, 09:39 AM   #8 (permalink)
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^^ By OEM/factory, I referring to the one that you don't have to "wire" yourself, it just plugs in.

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Old 07-06-2009, 01:58 AM   #9 (permalink)
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BTW OEM, at one time at least, was/is Bosch.
I disagree... in my 2005 EJ253 engine OEM sensors are Denso...
Front is wideband and rear is classic but operate in 0.6 - 1.2V probably...
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Old 07-06-2009, 03:52 AM   #10 (permalink)
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My 99 RS, 97 Outback and a few others I've pulled out were Bosch which is why I said at one time. Like most auto manufactures they except bids on parts and will change vendors depending on who gives the best price.
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Old 07-06-2009, 03:56 AM   #11 (permalink)
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My 99 RS, 97 Outback and a few others I've pulled out were Bosch which is why I said at one time. Like most auto manufactures they except bids on parts and will change vendors depending on who gives the best price.
That is true :) And to be true, there is possible to connect bosch sensor insted of denso, only you must pay attension to correct cross wires. They should be in different colors depend on producent. Bosch usually have 2 x white, gray and black wire, denso: 2x black, blue and white.

and this is wiring diagram of different oxygen sensors:


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Old 07-27-2009, 01:22 AM   #12 (permalink)
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heh and my front oxygen sensor died... more specyfic: sensor heater...
i decide to buy oem sensor... price is not small - about 120$
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Old 08-19-2009, 10:56 AM   #13 (permalink)
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Ok, tired of dealing with my (inept, rude, did I mention inept?) dealership. Need to replace my own rear O2 sensor (on an '02, interestingly) and... excuse the newbie idiocy, but are they the same and just go in different spots? Can't be!

The front is the A/F mixer, and the rear 'just' senses response.

I was looking at this site

Discount Car Parts Stuff - Car Accessories & Truck Accessories - Cheap Auto Parts - Car Cover - Floor Mats - Cargo Liner - Subaru Forester Oxygen Sensor Replacement - Subaru Forester Replacement Oxygen Sensor
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Old 08-19-2009, 01:17 PM   #14 (permalink)
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No they are not the same or they aren't interchangeable. Do yourself a favor and make it easy on yourself. Get a direct plug in type (be it from AutoZone, Dealer or other) and don't get a Universal one where you have to cut and splice. Spend the extra money and get the plug an play one. I have info on scoobymods on how to change it out.
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