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Old 01-01-2012, 12:45 PM   #1 (permalink)
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Default o2 Sensor Heater, code P0037

On my 2006 Outback with 104,000 miles I'm getting a CEL and the following code:

P0037 HO2S Heater Control Circuit Low (Bank 1, Sensor 2)

The wires to the sensor appear to be in good shape. Is there a fuse which protects the o2 sensor heater circuit? If so, where is this fuse located on this car?

thanks very much.
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Old 01-01-2012, 09:07 PM   #2 (permalink)
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Quote:
Is there a fuse which protects the o2 sensor heater circuit?
SBF-5, 30 Amps, in the engine compartment fuse box.
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Old 01-02-2012, 04:13 PM   #3 (permalink)
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Perfect. Many thanks for your help.
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Old 01-02-2012, 05:23 PM   #4 (permalink)
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sensor 2 is after the cat right?
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Old 01-02-2012, 06:53 PM   #5 (permalink)
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Yes. It's the rear sensor.
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Old 01-11-2012, 08:30 AM   #6 (permalink)
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Replacing the rear O2 sensor corrected the problem, removed the CEL and cleared the code. O2 sensor was $57 from AutoZone, the cheapest part available - requires you to wire the old connector to the new sensor. A bit of a hassle, but so far, it works fine.
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Old 01-11-2012, 09:35 AM   #7 (permalink)
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^^^thanx for the update!
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Old 10-14-2013, 02:25 PM   #8 (permalink)
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Quote:
Originally Posted by burton4320 View Post
Replacing the rear O2 sensor corrected the problem, removed the CEL and cleared the code. O2 sensor was $57 from AutoZone, the cheapest part available - requires you to wire the old connector to the new sensor. A bit of a hassle, but so far, it works fine.
Wow, that's quite a difference in price compared to what is around here. The local Carquest, O'reilly's, and NAPA all start around $100. On Amazon it's $56 and some change with free shipping, kind of crazy.
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