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Old 03-27-2006, 03:55 PM   #1
chaddeus
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Default P0171 Engine Code

I am having this code and its says A/F Too Lean. So I had the car send to Subaru and they told me it was caused by faulty 02 Sensor and its gonna cost me $421 including labor and tax to fix the problem.

Now, I am wondering why is it that expensive? Isn't an 02 sensor supposed to be like $100? Its crazy that its cost so much. Anyway, Should I actually have Subaru to fix it or can I find a mechanic to fix it?

Btw, I have a catless downpipe with a Greddy Evo2 exhaust system and used the mechanical fix to fix the 02 engine light check issue. I know there are a lot of you guys who used the mechanical fix and yet never had any issue with the 02 sensor. What do you guys think?

- Charles
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Old 03-27-2006, 04:11 PM   #2
D fresh
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The labor cost is probably whats making it so expensive. It probably isn't the sensor you did the Mech fix on. IIRC there is one earlier on in the sysem but I'm not totally positive.
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Old 03-27-2006, 04:17 PM   #3
chaddeus
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I was told that the O2 sensor cost ~$270 + Labor of $150 by the dealership.

- Charles
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Old 03-27-2006, 04:19 PM   #4
D fresh
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Quote:
Originally Posted by chaddeus
I was told that the O2 sensor cost ~$270 + Labor of $150 by the dealership.

- Charles
Wow, that is a bit steep.
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Old 03-27-2006, 04:22 PM   #5
Mulder
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The front 02/AF sensor in the WRX and STi is a semi-wideband type and considerably more expensive than the standard narrowband type. That labor cost does seem a bit much though, there is an access opening in the passenger fender lining and the 02 is right behind that so I don't see replacement taking 2 hours.
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Old 03-27-2006, 04:23 PM   #6
CirrusWRX
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Please note the following thread:
http://forums.nasioc.com/forums/show...ighlight=p0171

That's great they figured it out so quickly, but I wouldn't be forking over $400 unless they're positive that will fix the problem. It happened to fix PAWRX's problem, but that was after trying NUMEROUS other things...
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Old 03-27-2006, 04:23 PM   #7
chaddeus
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I assume the O2 sensor is the one that is located at the air intake. I have the stock air intake and its causing the problem?

- Charles
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Old 03-27-2006, 04:24 PM   #8
chaddeus
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Anyway, is the parts they quoted me reasonable? $270 after tax

- Charles
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Old 03-27-2006, 05:00 PM   #9
CirrusWRX
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Quote:
Originally Posted by chaddeus
I assume the O2 sensor is the one that is located at the air intake. I have the stock air intake and its causing the problem?

- Charles
No that's the Mass Airflow Sensor. Different animal. If you have the stock air intake, then it's probably unlikely the MAF that's causing the problem.

$270 is probably about average for the front o2 sensor. Not great, not rape.
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Old 03-27-2006, 05:28 PM   #10
Jon [in CT]
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Quote:
Originally Posted by chaddeus
I assume the O2 sensor is the one that is located at the air intake. I have the stock air intake and its causing the problem?
Are you sure the Subaru tech didn't say "air sensor" instead of "oxygen sensor?"
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Old 03-27-2006, 05:33 PM   #11
chaddeus
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the subaru tech say 02 sensor so i guess its oxygen sensor. Its my mistake assuming its the air sensor

- Charles
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Old 03-27-2006, 06:21 PM   #12
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OXYGEN SENSOR, Impreza, 2.5L, No.1 04-05 List Price $350.48 Your price $252.35

from www.1stsubaruparts.com

so not a bad price.
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Old 03-28-2006, 09:21 PM   #13
chaddeus
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i am confused. The dealer told me its part 22641AA211 and a quick check online shows that its only $145.16.

My god. problems after problems..

- Charles
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Old 03-29-2006, 12:31 PM   #14
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anyone?

- Charles
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Old 03-29-2006, 02:18 PM   #15
CirrusWRX
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Ahh - i think incognito looked up a normally aspirated 2.5L engine, not the turbo model.

Chaddeus - I think you're correct- $150 sounds more reasonable, and you can get it from http://www.subaruparts.com

my advice? find a knowledgeable scooby buddy in your area, pay him $50 and lunch/beer to jack up your car, remove your right front wheel, (he should also have an o2 sensor socket, or you can buy one for $10 at autozone) and replace your sensor saving you about $200+ and making a new friend in the process.
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Old 03-29-2006, 02:42 PM   #16
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How many 02 sensor are there in the STi? Furthermore, I am also confused with the part. I saw from www.subarugenuineparts.com that the oxygen sensor cost about $300 for the 04 STi.

- Charles
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Old 03-29-2006, 05:21 PM   #17
CirrusWRX
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The kind that you're referring to, 2. One in the front and one in the mid pipe area. From what you wrote and if the shop is correct in their diagnosis, you need just 1 - the front o2 sensor.

I think you're looking at the wrong part for $300- the part number you posted (which is what the shop should have given you, right?) shows the following for my search:

22641AA211 $199.95 $0.00 $145.16
Emission system - Emission components - Ft oxygen sensor
Ft oxygen sensor - 2.5 liter turbo 2004 2004


The $199.95 is the list, $145.16 is your discounted price.

If you just search for oxygen sensor, you'll see one that costs about $300 for a 2.5L motor- but it's for NON turbocharged models.
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Old 03-29-2006, 06:16 PM   #18
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Quote:
Originally Posted by CirrusWRX
From what you wrote and if the shop is correct in their diagnosis, you need just 1 - the front o2 sensor.
In my mind, that's a very big IF for two reasons.

The procedure in the shop manual for diagnosing this trouble code does NOT involve any checking of the front AFR sensor.

The only way to decide that the front AFR sensor in no good, in the absence of any front AFR sensor related trouble code, is to actually replace it with a known good sensor and then observe that the P0171 doesn't come back. What are the chances the service tech did this?
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Old 03-30-2006, 10:47 AM   #19
CirrusWRX
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I'm in total agreement with you Jon - hence why I posted PAWRX and CirrusWRX's insane troubleshooting fishing expedition on the P0171. We fought with that thing for weeks and it FINALLY ended up being the sensor.

So as said before, if you want to go on the shop diagnoses, go right ahead. If you pay them the $400 just make sure you GET IN WRITING that they gaurantee that's the problem and not something else.
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Old 04-25-2008, 11:36 AM   #20
CyborgX_CZ
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wrong thread... sorry

Last edited by CyborgX_CZ; 04-25-2008 at 11:40 AM. Reason: wrong thread
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Old 04-25-2008, 03:02 PM   #21
06mattsti
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i got that same code last month. it was because my gf put gas in the car and didnt tighten the cap all the way. took about a month for the cel to go away.
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Old 04-25-2008, 04:58 PM   #22
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I would suggest you read this thread http://forums.nasioc.com/forums/show...ighlight=p0171. I was having issues with this same code for about a month and finally found a vac leak was the culprit.
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Old 05-26-2008, 12:15 AM   #23
CanadaBeau
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I have been having the same problem (P0171) recently. I also can hear a slight exhaust leak, so I took it to the dealership to get things looked at.

They found the same front 02 sensor was damaged, probably when the last owner replaced the exhaust. Anyway, I went to SubaruParts.com and ordered one for around $180.00 (otherwise the dealership would have charged me $450, parts alone - the cost of living in Canada I suppose). I'll update you after I install the new sensor, but I'm pretty confident this will fix the P0171.

By the way: this is the part number for the front O2 sensor: 22641-AA211.

Last edited by CanadaBeau; 05-26-2008 at 12:17 AM. Reason: Forgot to add the part number
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Old 05-26-2008, 09:47 AM   #24
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Also they may be planning to reflash the car. I had that happen when my o2 sensor went bad.
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Old 05-26-2008, 02:14 PM   #25
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I had 3 things causing or contributing to this CEL:

- bad crosspipe gaskets (exhaust leak before the front O2 sensor)
- small vacuum leaks (clamps not tight enough or poorly placed)
- leaking bypass valve. This turned out to be the true culprit, but I found the other things in the process.

They should not need to reflash the car for any reason. A simple ECU reset will be fine.
Also, I am wondering if the ECU has been reset at all to see if the code comes back.

If it were me, I would plug it into a laptop and watch the front O2 sensor data to see if it truly is in need of replacing, or if something else is causing the code.
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