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Unread 07-29-2009, 02:27 AM   #1
ef1992
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2001 WJ 
 
Join Date: Apr 2009
Location: Torrance
Posts: 300
Wondering about my P0161 and what it effects

www.wjjeeps.com says the following:

Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

What part of my Jeep is this effecting exactly? Put it in layman's terms please!

My CEL came on and I did the OBD and thats what I got.\

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Unread 07-29-2009, 06:38 AM   #2
greasefingers
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Location: Northern VA, USA, NJ
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The O2 sensor fine-tunes the fuel management system and keeps the emissions low. Keep in mind that the PCM does not use the sensor under the following conditions: cold engine, acceleration, or deceleration. It is basically used during constant speed. If it is bad your fuel economy will decrease.
The O2 sensor will not perform correctly unless it is hot. Therefore the engine must be at operating temperature before the PCM/ECU (computer uses it). The heater element helps to get it hot quicker which helps emissions. If the heater element, which is an integral part of the sensor, does not work (because it is broken) then the PCM stores a code.
Simply have it replaced with an OEM type only.
Oxygen sensors are probably the least reliable sensor on any vehicle. The volt output should ave around 0.45 volts
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Unread 07-29-2009, 03:01 PM   #3
20jeepwj00
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2000 WJ 
 
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there is a pcm flash for 02 sensor heater failures,if your pcm has never been updated this will probably fix you problem.
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Unread 07-29-2009, 03:31 PM   #4
rm2001wj
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Quote:
Originally Posted by ef1992 View Post
www.wjjeeps.com says the following:

Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

What part of my Jeep is this effecting exactly? Put it in layman's terms please!

My CEL came on and I did the OBD and thats what I got.\
Your 01 WJ has 4 oxygen sensors. The actual trouble code (format P0xxx) will tell which one has the faulty heater. Although greasefingers is corrrect, it is also true that the upstream sensors are somewhat more important for setting the mixture correctly. Your code refers to a downstream sensor.
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