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Old 09-11-2008, 09:05 AM   #1
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Default O2 Sensor Replacement - B2S1 on 3.0L

I got a P0050 OBDII code:
H02S - Bank 2 Sensor 1 Heater Circuit.

From the forums I've discovered:
-how to check the heater
-this is the driver side front sensor
-the driverside front sensor is difficult to replace

I'm asking a few things to anyone who has experience with this or knows:
1- where is the connector for this sensor so I can test it(where in the engine compartment)?
2-where is the sensor installed
3-how would one replace it
4-is this worth going to the dealer/shop for?

thanks for any help you can provide!

Cheers,
Doug
2002 A4 Quattro 3.0L 6-speed
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Old 09-11-2008, 10:01 AM   #2
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Default Re: O2 Sensor Replacement - B2S1 on 3.0L

I've been told that "Bank 2" is the passenger side cat???

Jim
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Old 09-11-2008, 10:13 AM   #3
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Default Re: O2 Sensor Replacement - B2S1 on 3.0L

Really? It's not unlikely that I'm mistaken. I was going by the tech article "understanding oxygen sensors" the 10th one down here: http://www.audiworld.com/tech/eng.html
That was for B5 chasis; i assumed it was correct and didn't change.

Anyone know for sure?

-Doug
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Old 09-11-2008, 12:17 PM   #4
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Default Re: O2 Sensor Replacement - B2S1 on 3.0L

I did some checking: "Bank 1" is the cylinder head that starts with cylinder #1 as in 1-2-3 (passenger side) "Bank 2" is 4-5-6 (drivers side). So you are correct.

Jim
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Old 09-11-2008, 01:01 PM   #5
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Default Re:[update] O2 Sensor Replacement - B2S1 on 3.0L

So the shop estimates 3.7hrs of work to replace the driver side upstream oxygen sensor. Anyone know how far tucked away this thing is?
est:
Bosch sensor:$173
3.7 hours labour:$303

-Doug
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Old 09-12-2008, 06:24 AM   #6
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Default Unbolt the coolant res and rotate it out of the way...

I've got a good look at the passenger-side one before and I think that one is easier. I'm guessing it would only take about 5 minutes to figure out if are going to be able to reach down there easily or not.
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Old 09-12-2008, 06:24 AM
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Tags
2002, 27t, 30, a4, audi, b2s1, b5, bank, circuit, heater, location, o2, oxygen, replacement, s4, sensor


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