O2 sensor location

Tiny
BUTERBWA
  • MEMBER
  • 2004 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
How many O2 sensors are in this car and where are they located?
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Wednesday, September 17th, 2014 AT 5:35 AM

14 Replies

Tiny
HMAC300
  • EXPERT
It looks as though there are 3 total, location depends on what series 1.7L engine you have. Per the manual the 2nd and 3rd sensors should be replaced as a set

Heres a guide to read about replacing the oxygen sensors

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

See the diagrams below for locations for all 1.7L engines
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Wednesday, September 17th, 2014 AT 6:25 AM
Tiny
BUTERBWA
  • MEMBER
It is a 2004 Honda EX. From your Pics I take it that it has two O2 sensors?
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Wednesday, September 17th, 2014 AT 7:20 AM
Tiny
HMAC300
  • EXPERT
No, according to the manual there are 3
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Wednesday, September 17th, 2014 AT 8:30 AM
Tiny
JD0977
  • MEMBER
  • 2004 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 50,000 MILES
Where is the oxygen senser located on the car?
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi jd0977,

They are mounted on the exhaust maniflod, before and after the catalytic converter.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
NILS NYSETHER
  • MEMBER
  • 2001 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • FWD
  • MANUAL
  • 140,000 MILES
My catalytic converter keeps throwing an engine code p0132, 02 sensor 1 bank 1 high voltage, I have replaced the 02 sensor and the code keeps coming back. And quite often while driving I feel the car shutter and as I try to accelerate the rpm's start dropping and the engine starts losing power until I press the gas pedal all the way to the floor and the rpm's will jerk back up to where it is supposed to be and I have had it sputter out and die multiple times and stop light. When that happens I have to put the car in neutral and rev the engine to keep it from dying.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
RIVERMIKERAT
  • MEMBER
It could be a plugged catalytic converter or bad wiring between the O2 sensor and the computer. I have included screenshots of the diagnostic steps we have for the P0132 error code.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
JIGGER
  • MEMBER
  • 2000 HONDA CIVIC
Engine Mechanical problem
2000 Honda Civic 4 cyl Automatic 6,700 miles

Check engine light is on. AutoZone read codes PO136 & PO137. Both codes are for oxygen sensor 2 in bank 1. PO136 says a malfunction exists in electrical circuit for the sensor. PO137 says input voltage from sensor is too low for current operating conditions. AutoZone says oxygen sensor 1 is closest to the cylinder head before the catalytic converter, while oxygen sensors 2 & 3 are located further downstream and are typically mounted in or after the catalytic converter. It also says bank 1 identifies the location of cylinder while bank 2 identifies the cylinders on the opposite bank.

Because car is driven so seldom, I'm not concerned about poor gas mileage. Car is running fine so fuel mixture must not be lean. Dealer quoted $220 to replace sensor and said engine isn't being damaged as long as fuel mixture isn't lean. I don't want to spend money to replace sensor. Will there be any problems?
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
OBXAUTOMEDIC
  • EXPERT
Yes, maybe not in the very near future as long as vehicle isn't driven much, but will eventually cause failure of the Catalytic Converter and can cause engine damage. The sensor being bad will cause rich and lean run times.

You could probably replace the sensors yourself and save at least half if not more. They are not that difficult to change.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
TRICHARD310
  • MEMBER
  • 2000 HONDA CIVICHONDA CIVIC
I have a 96 honda civic dx(D16y7) 5 speed manual transmission. I recently installed a header in place of the manifold. After install, the car smokes after about 15 sec of run time. I noticed the old manifold had a cat connected to the manifold. This is where the sensor was located. Now the sensor is at the back of the header with the first cat removed. What could be the problems?
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
BRUCE HUNT
  • EXPERT
Here is an honest answer. You have messed with the system, the O2 is expecting the output to be something after a cat has done its job but now the O2 is getting a richer reading. You will probably experience other issues as well.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
HALOTIMES2
  • MEMBER
  • 2000 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 149,000 MILES
I replaced the front oxygen sensor. The rear sensor wires looks like they head into the car on the driver side. Where do I locate the plug from the old sensor?
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
F4I_GUY
  • EXPERT
For the rear sensor, there is a little grommet you must remove, then gently tug on the wiring harness and you'll see the connector. Simply un-clip it and remove.

You may have to remove an exhaust heat-shield to access it.
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Sunday, November 18th, 2018 AT 6:54 AM (Merged)
Tiny
NILS NYSETHER
  • MEMBER
If you replaced sensor1 and 2 and they didn t cost over $300 and $500 respectively, you installed the wrong sensors causing the problems
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Monday, December 17th, 2018 AT 9:37 AM

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