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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-24-2013, 01:24 PM   #1
Corey_325xi
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Oxygen sensors

How do I know which O2 sensors are bad ? If/when they go bad what are the symptoms ?


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Old 07-24-2013, 02:11 PM   #2
cgrizzly888
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You'll get a check engine light if the o2 sensor fails.
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Old 07-24-2013, 02:12 PM   #3
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Oxygen sensors

And the cel will tell you which ones are bad.


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Old 07-24-2013, 02:39 PM   #4
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Oxygen sensors

Wait for the check engine light to come on giving you codes for the sensors.


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Old 07-24-2013, 02:48 PM   #5
Corey_325xi
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Oxygen sensors

Thanks guys, going to get codes checked in less than an hour when I get off work, then replacing tomorrow or Sunday. Bought the service manual from Bentley, fairly easy job


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Old 07-24-2013, 03:37 PM   #6
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???

Something does not make sence here.

You do not always get a CEL for an O2 sensor when one goes bad. You could get a CEL and associated code when an O2 senor is faulty, lazy or bad.

Also you typically get codes when the CEL comes on that may state something about the O2 sensor or other sensors, but this does not mean it/they may be bad.

You have to be VERY careful how you interpret DTC trouble codes and what they actually mean. Most of the time trouble codes that mention a sensor does not mean the sensor is actually bad! Reverse of what you usually think is going on.

Appears you recently purchase this car??

Suggest you read this - http://forum.e46fanatics.com/showthread.php?t=967204

You need to purchase your own OBDII reader.

You also need to read the links below in my signature.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-24-2013, 03:56 PM   #7
Corey_325xi
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Oxygen sensors

Yes bought the car 6 months ago. Thanks that helps


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Old 07-24-2013, 06:22 PM   #8
Shanealan
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Easy to replace as well, I did my pre cats last week, changed out the spark plugs and car runs a lot better.
If you have any questions, don't hesitate to chirp back.
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Old 07-24-2013, 11:27 PM   #9
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Quote:
Originally Posted by Corey_325xi View Post
How do I know which O2 sensors are bad ? If/when they go bad what are the symptoms ?


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No symptoms beyond the Check Engine (SERVICE ENGINE SOON) light.
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Old 07-25-2013, 08:53 AM   #10
Corey_325xi
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Oxygen sensors

Thank you guys. It was the coil packs, she is running a little lien but it might not be the O2 sensors I guess


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Old 07-25-2013, 08:55 AM   #11
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What are your Long Term Fuel Trim values at idle after driving for a bit and warming the engine up?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-25-2013, 08:58 AM   #12
Corey_325xi
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Oxygen sensors

I'm sorry I'm really new to all this honestly. I'm trying to learn. What does that mean ?


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Old 07-25-2013, 09:29 AM   #13
jfoj
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OBDII Scan tool that can read and display real time data.

Locate and display the Long Term Fuel Trim values for Band #1 & Band #2. It should be in a % hopefully not negative value. Typical/proper Long Term Fuel Trims are 0-2.5%. Lean codes trigger usually after 10%.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-25-2013, 03:19 PM   #14
Corey_325xi
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Oxygen sensors

How much do one of those run ? Would be a great investment


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Old 07-25-2013, 03:39 PM   #15
jfoj
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$20 to $100 or more depending on what you are looking for and if you want a stand alone unit, something that works with a smart phone or computer.

Read this - http://forum.e46fanatics.com/showthread.php?t=967204

I personally use both Torque Pro on my Droid phone and my Launch CReader VI very often. I just recently also purchased a Launch CRP123 which reads and clear OBD, ABS and SRS/Airbag codes on almost 30 different manufacturers.

You will save the cost of the tool the very first time you use it to solve a problem on your car. Even if it is to keep a shop honest and/or call BS on them. With labor rates in excess of $100 per hour, you can see how quickly one of these tools can save you a bunch of cash.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 07-25-2013 at 03:40 PM.
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Old 07-26-2013, 12:23 PM   #16
hummer
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This post should have started by you telling us what codes are present?
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Old 07-26-2013, 03:32 PM   #17
jfoj
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The problem is most car owners do not realize that an OBDII reader is as necessary as the car keys unless they want to surrender their wallet and soul to repair shops and the dealer.

When OBDII reading equipment can be had for less that the cost of a half tank fuel it baffles me why EVERYONE does not have one??

What happens is everyone waits until they need one, then they decide to borrow one or purchase one.

There are PLENTY of things you need and OBDII tool for LONG before the CEL/SES/MIL light comes on.

Verifying engine temps and fuel trims and noting what is "normal" is just one of the things you can do long before the CEL/SES/MIL lights up.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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