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Old 04-12-2008, 06:34 PM   #1
nfisheremti
Scooby Newbie
 
Member#: 69459
Join Date: Aug 2004
Location: utah
Vehicle:
2014 2.0 hatch
pearl white

Default o2 sensor location

i have a check engine light on. the code reads:

o2 sensor bank#1 sensor #2

the local shop that read the code for me, said that was the front sensor. i called the guy that usually works on my wife's car (a subaru specialty shop), he said it was the rear (and it would cost $200 to replace it). so i figured i would do it myself.

i called the dealer and they told me it was $147 for the new sensor, so i started looking on-line. i got a parts help chat going and the guy at the other end told me b1 s2 was the front. AAAAAAAAAAAAA
so i called the dealer they told me it was the rear. fhweh! boy i'm glad that's been cleared up

so i've got 2 votes for front and 2 for rear. i've never really thought of car repair as a democratic process. so does anyone really know which it is? it would make sense that sensor #2 is the rear, but what is this bank#1 bs? is that there just to cause enough confusion that you take it to a professional?

please enlighten me.

thanks.
/n
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Old 04-12-2008, 07:06 PM   #2
silver2004impreza
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Member#: 127878
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Front Royal
Vehicle:
2004 Impreza 2.5TS
2004 Outback sedan H6

Default

Bank 1 sensor 1 is the upstream O2 sensor. Sensor 2 is the downstream sensor. Anyone who says otherwise is wrong.

As far as the bank part goes, it refers to the cylinder banks. On our engines, since both heads blow into a common collector before the upstream sensor, we've only got 1 bank. Same thing with an inline engine, regardless of how many cylinders it has. On a V engine (be it a V6, V8, V10, etc), there are 2 banks. Bank 1 is the one that has cylinder 1 in it (typically the passenger side in the case of a longitudinally mounted engine, or at the back side in a transverse setup), bank 2 is on the other side.

The reason for the 2 banks is to let the tech know which sensor had failed. For example, a Ford Exploder with a 4.0 SOHC V6, has four O2 sensors. One in each exhaust manifold before the cat, and one in each manifold just after the cat. The exhaust then runs into a Y pipe and then travels out the back of the truck. In that case, Bank 1, Sensor 1 would be the one on the passenger side of the engine, before the cat. Bank 1, Sensor 2 would also be on the passenger side of the engine, after the cat.

I hope that helps.
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Old 04-12-2008, 07:10 PM   #3
nfisheremti
Scooby Newbie
 
Member#: 69459
Join Date: Aug 2004
Location: utah
Vehicle:
2014 2.0 hatch
pearl white

Default

yes, that helps. thank you.
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