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View Full Version : DIY: Post Cat O2 Sensor



fly300kts
10-31-2009, 10:29 AM
Hi Guys,

For a while now when checking the codes, P0139 or P1114 where popping up:

P0139: O2 Sensor B1 S2: Response too slow
P1114: O2 Sensor B1 S2: Internal resistance too high.

I had enough and decided to replace it. The Dealer wanted almost $200 for the part. I found a direct replacement (same Brand, Bosch with connector installed, at http://www.autopartswarehouse.com for $85 shipped)

So here is my DIY:

Time: 1.00 Hr
Difficulty: 3

Tools:

Torks T25
Ratchet + extensions
22mm Hydraulic wrench ($9.00 for the set at Harbor Freight)

First, how the wrench looks like

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03060Large.jpg

The post cat O2 sensor location

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03053Large.jpg

Disconnect the connector located right behind the coolant reservoir (Color Brown)

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03059Large.jpg

Then, to clear the wrench length, remove the heat shield hold in place with 3 screws.
First one

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03056Large.jpg

Second one

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03057Large.jpg

Third one (this one will require the ratchet extension)

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03058Large.jpg

Now the heat shield is out of the way

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03055Large.jpg

And you have plenty of room now for the wrench

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03054Large.jpg

The old one was in pretty bad shape

http://i31.photobucket.com/albums/c395/fly300kts/O2%20DIY/DSC03052Large.jpg

The threads of the new unit come already greased with anti-seize. When you install the new unit, make sure that you don’t pollute the tip of the sensor.
Tight the new one in place, reinstall the shield, reconnect the connector, clear the codes (if any), and your are done

Let me know if any question

Phil

AudiTFSI3o3
10-31-2009, 10:32 AM
great write up [up]

Insane_Audi
10-31-2009, 10:50 AM
well done :)

myb5quattro
10-31-2009, 11:27 AM
wow, great write up[up]

fly300kts
10-31-2009, 07:21 PM
Thank you

Phil

JRMSLINEA4
11-01-2009, 10:24 AM
Looking forward to knowing if this fixes your car.