Downstream O-2 Sensor. Quite A Fight!
Thread Starter
Joined: Dec 2007
Posts: 1,295
Downstream O-2 Sensor. Quite A Fight!
The Shops estimate to replace the Downstream Oxygen Sensor was $260.00
I think I paid that much doing it myself, ... just in aggravation.
Jack the car.
Undo the Exhaust flange at the U-bend.
Undo the Motor Mount Dogs and tip the Engine back.
Get the useless O2 Socket on the Sender with 1/2" Pry bar.
Socket spins ... Sensor don't move.
Cut the wires to Sensor off and apply 22mm Box Wrench.
No movement.
Hammer on Wrench, ... nothing.
Determination factor kicks-in.
Out comes the Heavy Duty stuff.
Rigged a Come-Along to the Driver side Rear Frame.
Knotted Nylon Strap to end of Wrench.
Took-up slack.
Added some additional pull.
Smacked Wrench with Plastic Hammer Head, ... heard a creak!
Increases tension.
Smack-2. Creak-2.
Tension, smack, tension, smack etc., -- Movement.
Tension, tension, tension ... turns.
Victory!
Remember me when you are swearing like crazy because that damn O-2 sensor don't want to budge for you.
Do the "Touque-Smack" on that little bastard and Victory will be yours!
Rick Massey
I think I paid that much doing it myself, ... just in aggravation.
Jack the car.
Undo the Exhaust flange at the U-bend.
Undo the Motor Mount Dogs and tip the Engine back.
Get the useless O2 Socket on the Sender with 1/2" Pry bar.
Socket spins ... Sensor don't move.
Cut the wires to Sensor off and apply 22mm Box Wrench.
No movement.
Hammer on Wrench, ... nothing.
Determination factor kicks-in.
Out comes the Heavy Duty stuff.
Rigged a Come-Along to the Driver side Rear Frame.
Knotted Nylon Strap to end of Wrench.
Took-up slack.
Added some additional pull.
Smacked Wrench with Plastic Hammer Head, ... heard a creak!
Increases tension.
Smack-2. Creak-2.
Tension, smack, tension, smack etc., -- Movement.
Tension, tension, tension ... turns.
Victory!
Remember me when you are swearing like crazy because that damn O-2 sensor don't want to budge for you.
Do the "Touque-Smack" on that little bastard and Victory will be yours!
Rick Massey
You seem to have a lot of trouble when it comes to your monte sometimes haha, the guy that did my ubend delete didn't seem to have a problem with it, but i don't think he would really complain about it either being a professional shop.
Thread Starter
Joined: Dec 2007
Posts: 1,295
I thought it was goingto be a walk in the park. Jack one side. Unscrew the Sensor and put-in the new one, ... like changing a light bulb.
BUT <--- The BIG but.
The Sensor is in the U-Bend and you can't lay a wrench on it without lowering the pipe.
Regrouped.
It was a nice Fall day, ... so I went after it.
Jacked-up the car.
You have to drive the car up on flat 2X8's to get some room for the Floor Jack.
I got the car jacked, the Sensor unplugged and the Front-doggies un-did when it started to rain.
Picked-up. Closed shop.
Rain delay.
Today I had to start by draining the driveway.
The towel I left over the drain so no sockets would get lost let the driveway flood.
No problem.
Gas powered hurricane blew-off the surface to an OK to crawl around condition.
I love my leaf blower.
Everything went like silk until I put the "Special O2 Socket" on and gave it the first shot.
Nuthin'!
I took it right up to ball-busting-just short of heart attack torque and it didn't budge.
Mother-you-know.
The O-2 Socket was opening and closing I put so much Hate-horse-power to it.
Regroup.
What?
I give myself Props for coming-up with the "Come-along Attack"
I even had the Nylon Strap affixed to the Wrench in a Non-slip configuration.
Started-off thinking the Wrench wasn't going to handle the punishment.
They should have had a Film Crew from Craftsman/Sears shooting this deal.
"And, ... No matter how hard you try to bring us back a broken Tool the Craftsman Brand will always surprise you."
Bingo.
After putting a strain on the wrench that looked like it was bending it, ...
Hitting it with a double-ended Rubber~Plastic Hammer Head while actually getting quite angry.
The story has a Fairy Tale ending, ...
Because I drove the Monte over to AutoZone and plugged-in the OBD2 Reader.
Reset. Read.
No Codes.
And they all lived happily ever after an afternoon of saving a couple-hundred bucks.
But, I'm not too sure I'd do it again.
I'm positive I wouldn't.
BUT <--- The BIG but.
The Sensor is in the U-Bend and you can't lay a wrench on it without lowering the pipe.
Regrouped.
It was a nice Fall day, ... so I went after it.
Jacked-up the car.
You have to drive the car up on flat 2X8's to get some room for the Floor Jack.
I got the car jacked, the Sensor unplugged and the Front-doggies un-did when it started to rain.
Picked-up. Closed shop.
Rain delay.
Today I had to start by draining the driveway.
The towel I left over the drain so no sockets would get lost let the driveway flood.
No problem.
Gas powered hurricane blew-off the surface to an OK to crawl around condition.
I love my leaf blower.
Everything went like silk until I put the "Special O2 Socket" on and gave it the first shot.
Nuthin'!
I took it right up to ball-busting-just short of heart attack torque and it didn't budge.
Mother-you-know.
The O-2 Socket was opening and closing I put so much Hate-horse-power to it.
Regroup.
What?
I give myself Props for coming-up with the "Come-along Attack"
I even had the Nylon Strap affixed to the Wrench in a Non-slip configuration.
Started-off thinking the Wrench wasn't going to handle the punishment.
They should have had a Film Crew from Craftsman/Sears shooting this deal.
"And, ... No matter how hard you try to bring us back a broken Tool the Craftsman Brand will always surprise you."
Bingo.
After putting a strain on the wrench that looked like it was bending it, ...
Hitting it with a double-ended Rubber~Plastic Hammer Head while actually getting quite angry.
The story has a Fairy Tale ending, ...
Because I drove the Monte over to AutoZone and plugged-in the OBD2 Reader.
Reset. Read.
No Codes.
And they all lived happily ever after an afternoon of saving a couple-hundred bucks.
But, I'm not too sure I'd do it again.
I'm positive I wouldn't.
Joined: Apr 2010
Posts: 12,605
From: Mentor, Ohio
When it comes to jobs requiring working in areas prone to rust, spend the week soaking the stuff with something like PB Blaster. It may nto always help, but it certainly WON'T hurt.
Thank GM for the U-Bend. They had this desire to stand the O2 sensor up. The only time I messed with my O2 sensor on my Monte was when I swapped my downpipe. Now, if I ever have to do anything with the O2 sensor, my socket will reach it with ease. I also dabbed some never/anti-seize on the threads when I put it back in.
Thank GM for the U-Bend. They had this desire to stand the O2 sensor up. The only time I messed with my O2 sensor on my Monte was when I swapped my downpipe. Now, if I ever have to do anything with the O2 sensor, my socket will reach it with ease. I also dabbed some never/anti-seize on the threads when I put it back in.
Joined: Nov 2009
Posts: 702
That sounds like the experience I had when I went to change the two pre-cat O2 sensors on my 98 Silverado 1 ton truck. I tried everything, even a special socket that works with a pneumatic hammer and they still wouldn't come out. I finally took it to an exhaust shop and they had to heat them up. They ruined one of the bungs and had to weld a new one in. It was the best $42 I ever spent.
I changed the pre-cat O2 sensor on my 2004 Monte Carlo and it was a piece of cake. I haven't messed with the rear one though.
Wayne
I changed the pre-cat O2 sensor on my 2004 Monte Carlo and it was a piece of cake. I haven't messed with the rear one though.
Wayne
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