O2 Sensor replacement
#1
Honda-Tech Member
Thread Starter
O2 Sensor replacement
Update Post 20
I have an original primary O2 sensor.
Since it is original, how hard is it going to be to get out? Should I spray it first with some PB blaster or WD40?
I was curious since it is 15 years old, should I replace it as preventive maintainance? No codes, but I have read sometimes it will not read a code if it is bad.
My car is running a little rich and gas mileage is not the greatest.
I had a recent tune up, plugs, wires, cap and rotor not terribly old?
I noticed on aftermarket sites:
Post-Catalyst is the the Primary on the headers?
and
Pre Catalyst is the the one near the cat?
Upstream is?
Downstream is?
I have an original primary O2 sensor.
Since it is original, how hard is it going to be to get out? Should I spray it first with some PB blaster or WD40?
I was curious since it is 15 years old, should I replace it as preventive maintainance? No codes, but I have read sometimes it will not read a code if it is bad.
My car is running a little rich and gas mileage is not the greatest.
I had a recent tune up, plugs, wires, cap and rotor not terribly old?
I noticed on aftermarket sites:
Post-Catalyst is the the Primary on the headers?
and
Pre Catalyst is the the one near the cat?
Upstream is?
Downstream is?
Last edited by motegicivic; 09-24-2011 at 11:10 AM.
#2
Resident Gearhead
iTrader: (1)
Re: O2 Sensor replacement
Hit it with a torch if you can.
IIRC the factory service manual recommends running the engine until the exhaust
piping is hot which can help in removal. Torch works better.
Check that the new sensor is grounded well. Very important that it is for performance sake.
EDIT: Definitely replace the sensor if it is that old.
IIRC the factory service manual recommends running the engine until the exhaust
piping is hot which can help in removal. Torch works better.
Check that the new sensor is grounded well. Very important that it is for performance sake.
EDIT: Definitely replace the sensor if it is that old.
#3
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
Hit it with a torch if you can.
IIRC the factory service manual recommends running the engine until the exhaust
piping is hot which can help in removal. Torch works better.
Check that the new sensor is grounded well. Very important that it is for performance sake.
EDIT: Definitely replace the sensor if it is that old.
I added this after you read my post,
Post-Catalyst is the the Primary on the headers?
and
Pre Catalyst is the the one near the cat?
IIRC the factory service manual recommends running the engine until the exhaust
piping is hot which can help in removal. Torch works better.
Check that the new sensor is grounded well. Very important that it is for performance sake.
EDIT: Definitely replace the sensor if it is that old.
I added this after you read my post,
Post-Catalyst is the the Primary on the headers?
and
Pre Catalyst is the the one near the cat?
#6
Honda-Tech Member
Thread Starter
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#8
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
What is the deal with Bosch ones, anyone using them? Advance only has those in stock. Plus a little cheaper. but noticed they have 2 part numbers as well for direct fit ones.
Is the up and down stream sensors the same on the 96 civic ex's? Unless the harness plug is different?
Is the up and down stream sensors the same on the 96 civic ex's? Unless the harness plug is different?
#9
Honda-Tech Member
Re: O2 Sensor replacement
Never use bosch on japanese cars...or american or korean for that matter.. Bosch is fine on european cars since they're designed with them in mind... Same with Denso, don't use denso on european cars.... Stick with what ever is OEM!!!!
#10
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
I thought that was for spark plugs?
#12
Honda-Tech Member
Re: O2 Sensor replacement
It applies to all parts... btw spark plugs are NGK not denso. I've seen many issues when people use bosch parts on a car that calls for Denso and vise versa. People can be so stupid sometimes, like the OEM part is $2 more on a $78 part and they'll still go with the cheaper one (bosch in most cases).
#13
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
96 civic EX
I looked at it today, I can not use a regular O2 wrench it will be too long to fit an will hit the radiator fan shroud. I might have to get a slim socket, you can get to it without removing the heat shield, it is supposed to come off, mine is rusted down, doubt I will be able to get it off.
Also, how do you unplug the harness from the metal tab? I am not talking about the disconnecting it, but one end is attached to a metal bracket.
I looked at it today, I can not use a regular O2 wrench it will be too long to fit an will hit the radiator fan shroud. I might have to get a slim socket, you can get to it without removing the heat shield, it is supposed to come off, mine is rusted down, doubt I will be able to get it off.
Also, how do you unplug the harness from the metal tab? I am not talking about the disconnecting it, but one end is attached to a metal bracket.
#15
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
For your EX, did you leave the heat shield on?
Also how do did you unplug it from the metal bracket?
#17
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
#20
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
Ok, put a socket on it, but it seems super stuck.
Just to make sure I am turning the right way, the sensor is in front of me, so to loosen I turn towards the passenger side right? (left?)
I might have to get a breaker bar, but I am afraid I might crack the manifold???? or break it off in the manifold?
I did spray it with PB Blaster a day before as well.
Just to make sure I am turning the right way, the sensor is in front of me, so to loosen I turn towards the passenger side right? (left?)
I might have to get a breaker bar, but I am afraid I might crack the manifold???? or break it off in the manifold?
I did spray it with PB Blaster a day before as well.
#21
Re: O2 Sensor replacement
I called bosch about the different part number pertaining to the same part. They said the only difference between the upstream and the downstream is the length of the harness attached to it.
#22
Honda-Tech Member
Thread Starter
Re: O2 Sensor replacement
#23
Re: O2 Sensor replacement
I went through the same problem with my 97 dx trying to get o2 sensors. Thats why I called bosch. I didn't have denso at my parts store and of course they couldn't help me.....
#25
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Re: O2 Sensor replacement
I cranked on it, holding the socket with one hand so it didn't torque, and it came loose with a "crack". Before that it didn't seem like it was coming loose.