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      06-20-2015, 07:15 PM   #1
Brian_Fantana
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Pre-Cat O2 sensor change pics

Ok this wasn't hard but definitely not fun or easy. Total time was about 1.5 hours. I put my car up on some cheap ramps from harbor freight which gave me about 4" of clearance from my chest.

My advice:

Don't waste your time trying to work around removing the transmission cover (6 screws) the skid plate (10 screws) or the passenger side sensor shield (2 screws).

The driver side is a cake walk and only required the transmission cover off to access the sensors electrical mount.

Passenger side has a shield that will require you to remove everything else to access the mount the electrical plugin sits in.

I'm not sure how bad these look but the carbon build up looks somewhat bad. I only turned over the engine to verify I wasn't throwing any codes.

I will drive it later to see if I can feel a difference.
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      06-20-2015, 07:18 PM   #2
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Here are the pics
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      06-20-2015, 07:23 PM   #3
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And some others


O2 sensor conditions
http://m.walkerproducts.com/o2-sensors/#conditions
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      06-23-2015, 11:48 AM   #4
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How is she running with the new plugs and O2 sensors?
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      06-23-2015, 12:00 PM   #5
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For you Brian Fantana..
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      06-23-2015, 07:10 PM   #6
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Quote:
Originally Posted by jdamore View Post
For you Brian Fantana..
Haha! Love that.

She is running fantastic. I'm noticing a huge difference in low RPM power. She just seems much more eager to run. I'm not sure if it was the plugs or the O2 sensors because I didn't drive it until they were both done, but wow. It may be in my head but my butt dyno lies to no man. Especially not me

You can see from the link I posted it seems like my engine seems to be running on the rich side as well. Perhaps this fixed or helped that? IDK but well worth the time it required.
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      11-11-2015, 12:41 PM   #7
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Quote:
Originally Posted by Brian_Fantana View Post
Haha! Love that.

She is running fantastic. I'm noticing a huge difference in low RPM power. She just seems much more eager to run. I'm not sure if it was the plugs or the O2 sensors because I didn't drive it until they were both done, but wow. It may be in my head but my butt dyno lies to no man. Especially not me

You can see from the link I posted it seems like my engine seems to be running on the rich side as well. Perhaps this fixed or helped that? IDK but well worth the time it required.
any pics where these sit ?
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      11-11-2015, 07:57 PM   #8
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Adding to the previous question, do you have the size wrench and torque values for the sensors?
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      11-18-2015, 03:54 PM   #9
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Quote:
Originally Posted by atruelunatic
Adding to the previous question, do you have the size wrench and torque values for the sensors?
Sorry I don't remember now. I want to say 15mm open head wrench but I can't remember.
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      11-18-2015, 10:02 PM   #10
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Quote:
Originally Posted by atruelunatic View Post
Adding to the previous question, do you have the size wrench and torque values for the sensors?
7/8th will do
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      09-27-2016, 02:09 AM   #11
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Quote:
Originally Posted by Brian_Fantana View Post
Sorry I don't remember now. I want to say 15mm open head wrench but I can't remember.
Thanks for the write up! For those tackling this job, these pre-cat O2 sensors require a 22 mm open-end wrench (7/8 inch is nearly the same size). Unfortunately the electrical plug end of the sensor is too large to fit through a ratcheting box-end wrench and there is not enough space to successfully use an O2 sensor socket, so you are stuck using an open-end wrench on this job.

To make removal of the old sensors a little easier:
A. Try to do this job while the exhaust is still warm (but not "burn yourself" hot)
B. Spray some Liquid Wrench on there to soak in the threads for a good 20+ minutes before removal
C. Help break the corrosion by slightly tightening the sensor onto the exhaust (maybe a 5 degree turn) before trying to loosen the sensor off the exhaust.

Here is a picture of my unsuccessful attempt to use an O2 sensor socket.

Last edited by Theodore; 12-12-2016 at 07:58 PM.
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      11-18-2016, 01:45 AM   #12
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Quote:
Originally Posted by Theodore View Post
C. Help break the corrosion by slightly tightening the sensor onto the exhaust (maybe a 5 degree turn) before trying to loosen the sensor off the exhaust.
I've been told to use a thread chaser after removal, but can anyone attest to skipping that step or performing Theodore's tip?
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      11-18-2016, 01:56 AM   #13
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Can you take a pic of where to press on the connector to disconnect the sensor from the harness?
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      12-12-2016, 07:47 PM   #14
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Great advice! I just got my precat sensor changed also and car seems to run a bit smoother.
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