DougFromBuf

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

Whomever

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

Jim

DougFromBuf

Really? It's not unlikely that I'm mistaken. I was going by the tech article "understanding oxygen sensors" the 10th one down here: https://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

Whomever

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

DougFromBuf

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

skeeball

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.