Oxygen sensor question

[sigtwenty]

Bosch 13559 is the OEM plug in for the front correct?

[das borgen]

all 4 are the same save for wire length.

the Googles tell me the 13559 has a wire length of 13.4 inches (340mm) but the parts diagram says 370mm for the front O2 sensors.....The parts diagrams from my experience include the connector in the wire length measurement but other places do not

so yes is your answer...get some 13559 and be happy

http://www.ebay.com/itm/Genuine-Bosch-13559-o2-Oxygen-Sensor-/380460379513?pt=Motors_Car_Truck_Parts_Accessories&hash=item589534ad79&vxp=mtr#ht_500wt_923

under $60 shipped

[kooljess]

How does one know if your O2 sensor is bad? Do you get a code of some sort? Does the "CHECK ENGINE" come on? Any indication? Enquiry mind wants to know. Thank you.

[sigtwenty]

Cool. Thanks. Auto zone sells them cheap but says not compatible with my car

[dantheman67]

How does one know if your O2 sensor is bad? Do you get a code of some sort? Does the "CHECK ENGINE" come on? Any indication? Enquiry mind wants to know. Thank you.

The check engine light will come on if the O2 heating element malfunctions or the sensor voltage is very, very off (read: out-of-bounds). Other than that, probably not.

For a more sure way of checking your sensors, a nice EasyDIS/INPA diagnostic setup will tell you real-time O2 sensor feedback voltage. See this screencap I took yesterday:

http://i1212.photobucket.com/albums/cc455/daniels_540/pic3.jpg


You also might want to check out this web site explaining O2 sensor function:
http://www.mr2.com/TEXT/O2_Sensor.html


Cool. Thanks. Auto zone sells them cheap but says not compatible with my car

From what I've seen on the ones that are half price, the sensor itself is compatible but you have to reuse and splice in the old connector. You're probably looking at the "universal" one. The wiring is what's "universal".

[purplecty]

Autozone has bosch direct fit and theyre cheapest ive seen for upstreams... They should fit...

[S.Hafsmo]

You also might want to check out this web site explaining O2 sensor function:
http://www.mr2.com/TEXT/O2_Sensor.html


Thanks for sharing this one. Information that'll come in handy. :)

[sigtwenty]

13477 is what the Bosch site says I need. So now I'm confused.

[purplecty]

Pre 99 is different than 99-01. Maybe your looking at wrong one... Pre or post cat?

http://www.autozone.com/autozone/parts/1998-BMW-740IL/Oxygen-Sensor/_/N-j9zhlZ9ixrp
These are for my 98...

Pre-13559-$61.99 ea.
Post-13475-$87.99 ea.

[sigtwenty]

Pre cats

[sigtwenty]

So 100% sure they are 13559?

[purplecty]

Yah go on oembimmerparts and autozone sites

[Nyc Dito]

Bosch 13559 up to 9/98 740's...Before cats...

[sigtwenty]

OK I'm grabbing some today at auto one. Hopefully ill get them in tonight

[007008]

Huh, everywhere I've looked says 13559 is for 98 and after. Even the Bosch site. pre 98 seams to be 13477. Perhaps its just wire length.

[das borgen]

the 13559 and the 13477 are the same save for wire length,,,they use the same sensor (LSH25)

source?
http://forums.bimmerforums.com/forum/showthread.php?t=1098031




Well I searched and couldn't find anything covering this in previous threads so I decided to answer my own question today:

Bosch 13477
Overall
http://images42.fotki.com/v1319/photos/9/925706/6804882/13477-vi.jpg

Sensor Head: (LSH25)
http://images41.fotki.com/v1341/photos/9/925706/6804882/LSH25Head-vi.jpg

Lenght: (320mm)
http://images40.fotki.com/v1335/photos/9/925706/6804882/320mm-vi.jpg

Bosch 13559:
http://images42.fotki.com/v1312/photos/9/925706/6804882/13559-vi.jpg

Sensor Head: (LSH25)
http://images43.fotki.com/v1328/photos/9/925706/6804882/LSH25Head-vi.jpg

Lenght: (370mm)
http://images40.fotki.com/v1338/photos/9/925706/6804882/370mm-vi.jpg

OEM Sensor: (M54B25)
http://images43.fotki.com/v1321/photos/9/925706/6804882/OEM-vi.jpg

Lenght: (320mm with LSH25 Sensor Head)
http://images43.fotki.com/v1330/photos/9/925706/6804882/OEM320mm-vi.jpg


Conclusion:
All the Bosch/OEM O2 sensors above are utilizing the same LSH25 Bosch sensor head and the only difference between each is the length of the sensors lead & price. So when shopping for your replacement I would recommend purchasing which every is least expensive in your local market.

[sigtwenty]

the 13559 and the 13477 are the same save for wire length,,,they use the same sensor (LSH25)

source?
http://forums.bimmerforums.com/forum/showthread.php?t=1098031

I noticed this in the store. I had them pull both. I went with he 13559 as they were 17 bucks less

[purplecty]

Put em in? Any improvement?

[pruner1]

http://www.amazon.com/13559-96-01-Oxygen-Sensor-318ti/dp/B007EIW39C/ref=sr_1_3?ie=UTF8&qid=1345602518&sr=8-3&keywords=Bosch+13559

$52.00

http://www.amazon.com/Bosch-13477-Oxygen-Sensor-Fitment/dp/B000GZEK00/ref=sr_1_1?s=automotive&ie=UTF8&qid=1345602870&sr=1-1&keywords=Bosch+13477 (http://www.amazon.com/13477-95-05-Oxygen-Sensor-750iL/dp/B007EIUE7K/ref=sr_1_2?s=automotive&ie=UTF8&qid=1345602641&sr=1-2&keywords=Bosch+13477)

$52.00

[sigtwenty]

Put em in? Any improvement?

Yes. Not drastic but definitely noticeable. My old ones were nasty.

http://img.tapatalk.com/46bde038-f037-be39.jpg