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How to determine which O2 sensor is bad

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Old 10-25-2009, 02:52 PM   #1
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Default How to determine which O2 sensor is bad

The check engine light is on, I checked with a scanner and the code is listed below, it does not tell me which one of the two sensors is bad. How can I determine that, I would appreciate any help

Code: P1166 HO2S11 Heater Circuit Fault.

Engine Info:
2000 Honda Accord EX 4 Cyl
F23A4
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Old 10-25-2009, 03:13 PM   #2
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Default Re: How to determine which O2 sensor is bad

P1166 is the air/fuel ratio sensor, which is the primary sensor.

Here is also a link with a pdf for a few test for code P1166.

http://www.driveaccord.net/forums/sh...d.php?p=229281
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Old 10-25-2009, 03:52 PM   #3
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Default Re: How to determine which O2 sensor is bad

I concur. It is the primary O2 sensor. The clue is in the code, HO2S1. If it were a problem in the secondary sensor, you would have read HO2S2.
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Old 10-25-2009, 03:59 PM   #4
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Default Re: How to determine which O2 sensor is bad

Thank you guys for the quick response. My OBD reader says that it has a problem with the heater but when I turn the ignition on the sensor heats up very quick
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Old 10-25-2009, 04:06 PM   #5
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Default Re: How to determine which O2 sensor is bad

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Originally Posted by atuvy View Post
Thank you guys for the quick response. My OBD reader says that it has a problem with the heater but when I turn the ignition on the sensor heats up very quick
It may heat, but it is not remaining heated. More than likely the internal resistance is out of range, thus the warning lamp.

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Old 07-20-2012, 06:45 AM   #6
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Default Re: How to determine which O2 sensor is bad

Can someone tell me where the air/fuel ratio sensor is on the 2008 civic si and why my dealer wants $583.00 to replace it?
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Old 07-21-2012, 12:51 AM   #7
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Default Re: How to determine which O2 sensor is bad

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Can someone tell me where the air/fuel ratio sensor is on the 2008 civic si and why my dealer wants $583.00 to replace it?
idk and cuz they suck

here you go http://www.8thcivic.com/forums/do-yo...placement.html

thats everything you need, literally part numbers a place to buy, also try BKhondaparts.com, and autopartswarehouse or even googling the denso part number

all you need is one normal looking wrench, don't bother with those retarded O2 sockets, theres no room to use them on there anyways
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Old 07-21-2012, 03:50 AM   #8
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Default Re: How to determine which O2 sensor is bad

I just cut the wires, and use a regular socket(Youre going to replace it anyway). Install use a regular wrench, or a flare socket/wrench
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02, 2002, af, civic, code, fault, faulty, heated, honda, o2, oxygen, p1166, primary, ratio, sensor, type

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