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Old 09-08-2015, 09:01 AM   #1
FWH
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Oil Temperature Sensor

Hi - new here! Searched, but couldn't find anything related to this.

Just changed power steering pump and oil filter housing gasket on 2001 325CI. Getting CEL and code is P0197 -Engine Oil Temperature Sensor Circuit Low Input. Right behind the housing was a connection for what various manuals have called Oil Temperature Sensor. Unplugged and reconnected but still getting code.

Forum searches for the sensor keep pointing to oil level sensor (in pan) and the coolant sensor. But not seeing anything related to the one that the manuals pointed to behind the oil filter housing. I'm assuming it's that one that's kicking off the code.

Has anyone experienced this? Any suggestions? Thanks!
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Old 09-08-2015, 12:09 PM   #2
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The oil pan level sensor, generally, when failing will show a yellow light on the dash (although mine failed with no light, so will replace at next oil change). An internet search on "BMW error code P0197" pulls up a test ... detach the oil temperature sensor and if code P0198 is thrown, replace the sensor. Haven't needed to do this, so just passing it along.
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Old 09-08-2015, 12:57 PM   #3
Phoenix330ci
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Mine failed without light but the code was there too.

By the way, I ended up getting a hella replacement, new in box for like $35 on ebay. I haven't installed yet, just another part waiting until I change the oil.

The guy I got mine from at the time had 3 of them new in box, so maybe he has the other two left.
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Old 09-08-2015, 01:35 PM   #4
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I dont think they fail commonly, the oil temp sensor anyways. Oil level sensors that fail will typically show the yellow oil light. Since you have a code for your temp sensor and not your level sensor, i would pull the connection and clean it all up with some contact cleaner and see if that fixes it. If not looks like its a 35 dollar part.

https://www.fcpeuro.com/products/bmw...or-13621433076
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Old 09-08-2015, 01:56 PM   #5
peteyz24
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The oil temp sensor is number 13 in this pic.
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Old 09-08-2015, 02:11 PM   #6
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Quote:
Originally Posted by peteyz24 View Post
The oil temp sensor is number 13 in this pic.
ya i posted the P/N
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Old 09-08-2015, 02:17 PM   #7
Sansho
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Best price on that BMW temperature sensor is TheBMWMiniPartStore for $30.11, so net a $30-$35 part. You can find non-BMW sensors for $10-$15.
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Last edited by Sansho; 09-08-2015 at 02:19 PM.
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Old 09-08-2015, 02:58 PM   #8
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Quote:
Originally Posted by peteyz24 View Post
The oil temp sensor is number 13 in this pic.
Oil temp sensor is located in the oil pan. In german we call it TÖNS, Thermischer ÖlstandsSensor.

Its a combination of oil temp and oil quantity sensor.

12 61 7 508 003
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Old 09-08-2015, 03:21 PM   #9
Sansho
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Quote:
Oil temp sensor is located in the oil pan. In german we call it TÖNS, Thermischer ÖlstandsSensor.

Its a combination of oil temp and oil quantity sensor.

12 61 7 508 003
Are you thinking about another BMW model? According to the BMW e46 engine parts diagram, the oil pan level sensor is called "Ölniveausensor" in German, and the oil temperature sensor next to the OFH is called "Temperatursensor Wasser/Öl".
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Old 09-08-2015, 07:44 PM   #10
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Quote:
Originally Posted by daniel_f. View Post
Oil temp sensor is located in the oil pan. In german we call it TÖNS, Thermischer ÖlstandsSensor.



Its a combination of oil temp and oil quantity sensor.



12 61 7 508 003

No...it is not. It is located in the oil filter housing. The parts diagram has already been posted and I linked the correct part
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Old 09-08-2015, 07:58 PM   #11
dknightd
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Dumb question. Does the e46 330 have an oil temperature sensor? If so, can I use it to monitor the oil temperature? If so, how? Thanks
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Old 09-08-2015, 10:01 PM   #12
Sansho
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Yes, the 330i has an oil temperature sensor that the engine computer uses, same as discussed above. You may be able to see the temp thru the hidden OBC functions on the dash (search for how to access it).
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Old 09-08-2015, 11:53 PM   #13
daniel_f.
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Quote:
Originally Posted by Sansho View Post
Are you thinking about another BMW model? According to the BMW e46 engine parts diagram, the oil pan level sensor is called "Ölniveausensor" in German, and the oil temperature sensor next to the OFH is called "Temperatursensor Wasser/Öl".
Well, my oiltempsensor was defective and i replaced the TÖNS, now my oiltemp is back... But change whatever you want You don´t need to listen to me What do i know about BMW´s

Last edited by daniel_f.; 09-08-2015 at 11:54 PM.
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Old 09-08-2015, 11:55 PM   #14
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Quote:
Originally Posted by dknightd View Post
Dumb question. Does the e46 330 have an oil temperature sensor? If so, can I use it to monitor the oil temperature? If so, how? Thanks
INPA displays the engine oil temperature. See this screen shot. Second from the bottom on the right side.
http://forum.e46fanatics.com/attachm...7&d=1329780379
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Old 09-09-2015, 01:17 PM   #15
FWH
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Quote:
Originally Posted by Sansho View Post
The oil pan level sensor, generally, when failing will show a yellow light on the dash (although mine failed with no light, so will replace at next oil change). An internet search on "BMW error code P0197" pulls up a test ... detach the oil temperature sensor and if code P0198 is thrown, replace the sensor. Haven't needed to do this, so just passing it along.
Thanks, everyone for the great feedback and parts info... I may try to detach it see if I get the P0198. Or heck, at $35 each I might as well just replace the temp sensor and then do the level sensor at the next oil change.

Cheers, all
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Old 09-09-2015, 03:20 PM   #16
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The oil temp sensor is right on the OFH. If I remember correctly, I paid about 30 for it from an online BMW dealer.
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Old 09-09-2015, 08:29 PM   #17
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Originally Posted by daniel_f. View Post
Well, my oiltempsensor was defective and i replaced the TÖNS, now my oiltemp is back... But change whatever you want You don´t need to listen to me What do i know about BMW´s
sorry man just because youre from germany doesnt defy factual information about BMWs. the oil temperature sensor is not in the oil pan, at least here in the US......
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Old 09-09-2015, 08:56 PM   #18
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Appears from RealOEM that both the European and North American non M E46 have the oil temperature sensor located in the oil filter housing near the oil pressure switch. The part number happens to be the same as the coolant temperature sensor as well.

This oil temperature sensor is VERY different than the oil level sensor (which happens to be a thermal sensor, but to my knowledge is not used in any way for oil temperature that is located in the oil pan). So at the end of the day the oil temperature sensor mounted in the oil filter housing is used to monitor the engine oil temperature.

See RealOEM - http://www.realoem.com/bmw/enUS/show...diagId=11_2201
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Last edited by jfoj; 09-09-2015 at 08:59 PM.
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Old 09-09-2015, 09:02 PM   #19
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^ This. Photo below of the oil temp sensor (#13621433076) in the oil filter housing. Thermal oil level sensor (#12617508003) is in the pan.

Click to view larger image.
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Old 11-16-2015, 01:22 PM   #20
FWH
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Hi all - here's an update. I just did oil change and replaced BOTH the oil temp sensor (on oil filter housing) and oil level sensor (bottom of oil pan. Reset the Check Engine Light and still got the code P0197 -Engine Oil Temperature Sensor Circuit Low Input.

Is it the wire itself?!?! Is that even replaceable? Any other ideas?

I'm constantly checking engine temp and oil levels and everything looks ok. I'm guessing it's something the car can live with, but want to avoid missing out on a real check engine light situation because the light is always on... Make sense? And it would hurt value if I sell the car.

Thanks!
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