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Old 01-30-2012, 10:28 PM   #1 (permalink)
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Question Replaced Front AF Sensor...Check Engine Light Still On

Hi folks, I'm new to this forum, and hope to be able to learn and share knowledge when I can.

I have a 2006 Subaru Outback 2.5 with about 143,000 miles. The check engine light has been on for awhile and I finally got off my six and took it in to get it diagnosed.

The folks at Autozone reported the code as being P0031. I took it to the dealer for something else and they found "code for front AF sensor. Left OSV valve. Check AF sensor, found open circuit."

I replaced the sensor with a Bosch 15172, as described on this video:

However, my check engine light is still on after being cleared by the guys at Autozone and after I disconnected the battery.

Does anyone have any ideas on what I should do? There is another sensor (with a yellow cable) just forward of the one that I replaced, but I don't know what it is.

Thanks in advance,

Scott
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Old 01-31-2012, 06:20 AM   #2 (permalink)
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"check sensor, found open circuit" - what was 'open' - is that an assumption based on the code or did they test something?

once cleared - how long before the check engine light comes back on again?
how long has it been on?
has the engine ever been removed or any major engine service done (headgaskets, clutch, etc?)?

if you replaced the front O2 sensor and the code still reappears I would suspect the wiring has a short in it somewhere - which is more likely if there's been any major work to the vehicle. a connector or wire got crushed/compromised somewhere.
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Old 01-31-2012, 11:40 AM   #3 (permalink)
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Thanks for the reply.

The stuff about the "open circuit" was on the printout that the dealer gave me. Their solution was to replace the AF sensor.

I actually have had some major work done on the car in the last 30 days, but the check engine light was on before that, and I believe it was the same code, but I am not certain of that.

Scott
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Old 01-31-2012, 11:50 AM   #4 (permalink)
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Looking up the code it comes as P0031 Front oxygen (A/F) sensor heater circuit low input.

The Bosch sensor you put in there, did it have a connector on it already, or did you have to splice on your old one?
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Old 01-31-2012, 11:53 AM   #5 (permalink)
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It had the Subaru connector on it already
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Old 01-31-2012, 12:07 PM   #6 (permalink)
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Two possibilities are either the new sensor is also faulty, or the problem is not with the sensor. It could be a wiring related issue. Probably need to look up the troubleshooting procedure. It seems a few years back there were some posts about the heater circuit issues and it turned out to be some relay that was faulty.
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Old 01-31-2012, 12:09 PM   #7 (permalink)
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Thanks. The suggestions that both of you guys made are about my pay grade to fix...I'll take it in to my neighborhood shop.
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Old 01-31-2012, 04:12 PM   #8 (permalink)
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Quote:
Originally Posted by wsbsmith View Post
It had the Subaru connector on it already
maybe the car's connector has a pin pushed back in it, is corroded or, as said, there's another wiring issue.
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Old 01-31-2012, 10:25 PM   #9 (permalink)
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Ooops. Looks like "bank 1 sensor 1" which is what the code reader said, is that yellow-cabled sensor, not the one I replaced. The new one will arrive tomorrow, so I'll see how it goes.
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Old 02-01-2012, 08:31 AM   #10 (permalink)
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Oh ok maybe you replaced the rear sensor? I don't know how many yours had, the earlier ones usually had just one front and one rear, but the H6's and maybe the later H4's could have one front on each side.
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