Question about 1994 Honda Accord

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O2 sensors Engine light came on. Analyzer said oxygen sensor. There are 2 sensors. They are probably just worn out. My solution is to buy 2 sensors and install myself. (Saves money). Do I buy them at a dealer? Where are these sensors? On the exhaust manifold? How do I get at them? (My daughter's car, out of town. I'd like to be ready when she comes to visit, and be ready to do the work. Thanks. Bill Vialardi

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  • wlumpl Aug 21, 2008

    Good solution. Clear and to the point.

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There are 2 O2 sensors on your Honda. Mine failed it's inspection due to the emmisions. One of them is on the exhaust manifold the other is just below. I purchased mine at Autozone. You could get them anywhere similar. It runs from 50-85 bucks each. Kinda expensive yes, but very simple to due.
You only need a couple of adjustable wrenches and some rust remover or bolt loosener, cause those things are gonna be a @#$%^ to get off without stripping them. If that happens your in trouble. Just remove the exhaust manifold cover and you should be able to get the old one of and just put in the new one twist it tight and your set. The one down below is a little more difficult. Depending on wether it is connected to the cat converter or not. Mine wasn't but i drive a civic. If its not connected than you can replace it the same way you did the top one. If it is connected to the cat then you need to get someone with specialty tools. And remove that piece of the exhaust then install.

Posted on Aug 21, 2008

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Where is the 02 Oxygen Sensor before the cadalic converter on a 2006 Hyundai Santa Fe


Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

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I've replaced both oxygen sensors on a 2001 ford focus n erased codes po135 n po141 n the engine light turned off after I started the car the second time check engine light lit up again n has the same...


The p0141 and p0135 codes both indicate that the O2 sensor heater circuit isn't working. If you've replaced the sensor and you're still getting these codes, there is probably a fault in the wiring or more likely a blown fuse. Refer to your owners manual for the fuse location.

Here is what EngineCodes.com says about P0135:

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem
http://engine-codes.com/p0135_ford.html#ixzz3RaTKiuBn

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Bank 1,sensor 2 .1997 Chevy half ton truck , where is it


downstream oxygen sensor, it is literally under your feet as you sit in the driver's seat. MIGHT E THE SENSOR, MIGHT BE A CLOGGED OR WORN OUT CAT CONVERTER. A pro shop will have an exhaust gas analyzer that they can use to tell which is bad (or both) without turning a wrench.

Or you can gamble and guess. Substitute parts for skill. After all, it's your truck. DO NOT BUY A DIRT CHEAP O2 SENSOR! They typically last a week longer than the warranty. Seriously, like a cheap alarm clock. 25359999-l0u5xrrbjmm23votbgnhzwek-3-0.jpg

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0152 coed


P0152 P0152 - O2 Sensor Circuit High Voltage Bank 2 Sensor 1Possible causes - Faulty Front Heated Oxygen Sensor Bank 2
- Intake air leaks may be faulty
- Exhaust gas leaks
- Front Heated Oxygen Sensor Bank 2 harness is open or shorted
- Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
eplacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem
Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
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Service Engine light code 431


Here is the definition for code 431.

P0431 MITSUBISHI Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).

A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed. The problem could be the catalytic converter, one of the O2 sensors, or an air leak in the exhaust system.

Read more: http://engine-codes.com/p0431_mitsubishi.html#ixzz2EnHWZTpR

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A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.



When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
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Hi Larry:
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There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

A code P0138 may mean that one or more of the following has happened:
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High fuel pressure (not as likely)

Here are some potential solutions:
Replace O2 sensor
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Check it; hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Fig. Heated Oxygen (HO2S) location (sensor 1)-2.4L engine

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Fig. Heated Oxygen (HO2S) location (sensor 2)-2.4L engine

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Fig. Heated Oxygen (HO2S) location (bank 1, sensor 2) (bank 2, sensor 2)-2.7L engine

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Fig. Heated Oxygen (HO2S) location (bank 2, sensor 1)-2.7L engine

I hope help you with this (rated this help). Good luck.

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