O2 sensors getting lazy?
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Cargo Master
Joined: Aug 2002
Posts: 2,013
Likes: 6
From: Cajun Country
O2 sensors getting lazy?
Is it possible that O2 sensors get lazy? Meaning,right before they go bad. My gas mileage has dropped almost 6 mpg in the last two weeks and I was told to replace my two upstream sensors. 
Elder User
Joined: May 2002
Posts: 778
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You will have four sensors, two up stream and two downstream. The ones on the left side (drivers side) are bank #2, and the (passanger side) are bank #1 The sensors will also be called sensor #1 or Sensor #2. Sensor #1 is close to the engine. Sensor #2 is near the converters. This is the same for both banks. I use a 7/8 box wrench a lot of times to change them out. The #1 sensor on bank #1 is a little tough to do. I have found that a long flat screwdriver pressed on the lock tab will work good to unplug the old sensor from the harness. Have the truck worm also helps, but watch that you dont get burned. The new sensor will come with antisieze on the threads dont get that on the new sensor. Not to bad to do 
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
The rear ones rarely need replaced. All they do is tell the PCM that the cat converters are working properly. They do not effect drivability.
I would replace the front two (closest to the engine). They are recommended to be changed every 60,000 miles due to carbon build up over time makes it hard for them to properly read the mixture.
Jimmy
I would replace the front two (closest to the engine). They are recommended to be changed every 60,000 miles due to carbon build up over time makes it hard for them to properly read the mixture.
Jimmy
New User
Joined: Jan 2004
Posts: 15
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From: lost wages, NV
I replaced mine last night. I was getting a misfire or "roughness" at about 1400rpm and now its gone. I replaced all four with the bosch ones @ about 55 each. That's 220 for 4 sensors. Better do something for my milage after an expense like that. Not to mention my burned, skinned knuckles. So much fun!
Freshman User
Joined: May 2003
Posts: 40
Likes: 0
From: Maryland
MRJ
How tough was it to replace the passenger side close to the engine o2 sensor. Did you remove the inner wheel well? I need to replace mine also.
How tough was it to replace the passenger side close to the engine o2 sensor. Did you remove the inner wheel well? I need to replace mine also.
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Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Theoretically, with OBD2, if they get slow (lazy) they will throw a CEL:
P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0145 O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0153 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0159 O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0165 O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0145 O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0153 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0159 O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0165 O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
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New User
Joined: Jan 2004
Posts: 15
Likes: 0
From: lost wages, NV
i did remove the wheel, but I am not sure it was necessary. If you are real patient you can get an open end 7/8 up between the heat sheild and the pipe. With a little light and some tolerance for pain, you should be able to get it out.
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