Oxygen sensor Bad??

[rparker]

Can anyone tell me How to detrmine if my O2 sensor is bad?? Other then the ncheck engine light coming on What would be the symptons of a bad oxygen sensor??

Thanks for the help

[plik]

Go to AutoZone and have them check you check engine light. If it's your O2 sensor then you'll get a code telling you that your O2 sensor is bad.

[kromdom]

hook car up to an OBD II scanner (borrow for free at local auto parts store) or a PEAKE code reader (need to buy or borrow one)

Good DIY here: http://www.bmwtips.com/tipsntricks/Exhaust/O2sensor.htm

[WhiteSe7en]

Can anyone tell me How to detrmine if my O2 sensor is bad?? Other then the ncheck engine light coming on What would be the symptons of a bad oxygen sensor??

Thanks for the help

There are several symptoms:
-Engine may surge and idle may become erratic.
-When it's cold, it will take longer than normal for it to warm up.
-High emissions.
-Engine may surge at highway speeds.
-Poor performance and fuel economy.
-May have black smoke from exhaust.
-No torque converter lock up.

[Bruse Wayne]

where is a good place to pick up a replacement O2 sensor?

[Qsilver7]

before telling him to hook it up to an OBD II scanner...perhaps we should ask him to identify WHAT year his e38 is...it may not be OBD II compliant if its a 1995.


rparker...you might want to consider adding model year to your car info...or create a signature that includes the model & year...it's very important in that it helps us help you better. Not all e38s are the same...and not all 740i/iLs are the same either. For instance, there are 3 different V8 engines (M60/M62/M62TU), 2 different transmissions, and multiple upgrades and changes throughout the production run. :)

[roys740]

I was just about to type the exact same thing. Q you are quik.

[plik]

where is a good place to pick up a replacement O2 sensor?

http://www.autohausaz.com/search/product.aspx?sid=hfvjtf55cbqmy1a11vmcpzjo&makeid=800003@BMW&modelid=1303254@740I&year=1998&cid=19@Emission%20System&gid=5132@Oxygen%20Sensor

$71.84 /each pre-cat (you need two)

http://www.autohausaz.com/secure/PartImages/13559.jpg


$98.17 /each post-cat (you need two)

http://www.autohausaz.com/secure/PartImages/13475.jpg

[Bruse Wayne]

thanks a lot plik

I believe the pre cat is bad, I just bought the vehicle and that was the only code it gave me.

Is the swap difficult to do at home?

thanks for the help :buttrock

[plik]

Very very easy. Just drive your girl up on ramps and slide right under. You don't have to do all four sensors at the same time, but you need to do both pre-cat sensors at the same time and both post-cat sensors at the same time. So you need to at least buy two pre-cat sensors.

http://www.bmwtips.com/tipsntricks/Exhaust/O2sensor_files/o2sensor1a.jpg

http://www.bmwtips.com/tipsntricks/Exhaust/O2sensor_files/o2sensor2a.jpg

http://www.bmwtips.com/tipsntricks/Exhaust/O2sensor.htm

[Bruse Wayne]

plik you are the man :buttrock