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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) oil temp sensor


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Last Post: Jan 31, 2008 8:42 PM Last Post By: pete0621
adamj318

Posts: 5
Registered: 05/23/07
oil temp sensor
Posted: Dec 8, 2007 5:21 PM
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I recently had a fender bender and damaged the front end of my A6 (2000 2.7t). I had the bodywork repaired but the oil temp gauge has not moved since. Is the sensor at the front of the engine where it would have been damaged in the accident? If it is bad or damaged is replacement an easy fix?

Any help is appreciated

Thanks - adamj318
FKH161

Posts: 7,611
Registered: 12/29/05
Re: oil temp sensor
Posted: Dec 8, 2007 5:51 PM   in response to: adamj318 in response to: adamj318
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Isn't it part of the sensor in the oil pan (see attached image)?

Wiring diagram shows fuse #5 as a power supply (10amp)...
adamj318

Posts: 5
Registered: 05/23/07
Re: oil temp sensor
Posted: Dec 12, 2007 10:36 PM   in response to: FKH161 in response to: FKH161
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I'll trace those wires to see if I can find the damage.

Thanks much for the help!
pete0621

Posts: 6
Registered: 01/22/08
Re: oil temp sensor
Posted: Jan 29, 2008 4:49 PM   in response to: adamj318 in response to: adamj318
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I have the same problem and question about where the heck is the oil temp sensor located? The oil level sensor in not the one. I disconnected that and there was no difference in the oil temp gauge reading. Would you (or anyone) please let me know if you know the location of the oil temperature sender on a 2000 A6 2.7T APB? Thanks
FKH161

Posts: 7,611
Registered: 12/29/05
Re: oil temp sensor
Posted: Jan 29, 2008 7:45 PM   in response to: pete0621 in response to: pete0621
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I disconnected that and there was no difference in the oil
temp gauge reading.

If your gauge is showing cold... disconnecting the sensor
will not cause it to read hot/move.

I took another look at the wiring diagram and I still think
that the temp sensor is incorporated into the level sensor.

Using a scan tool, access the Instrument Cluster Measuring
Blocks... value 050 (IIRC) will show oil temperature. If
the scan tool shows oil temperature, but the gauge does
not, then I would assume a fault in the gauge... wiring of
the sensor should be OK, since the Instrument Cluster Control
Unit is able to provide a temperature value to the Scan Tool.
pete0621

Posts: 6
Registered: 01/22/08
Re: oil temp sensor
Posted: Jan 29, 2008 11:57 PM   in response to: FKH161 in response to: FKH161
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I do appreciate your reply. Here's what I did. After running the engine until hot and getting about a 225F reading on the oil temp gauge, I shut off the engine and disconnected the oil level thermal sensor located on the bottom of the pan. Then with it disconnected I restarted the engine and the oil temp gauge returned to the 225 reading. do you know of a simple way to trace the gauge wire to the block?
FKH161

Posts: 7,611
Registered: 12/29/05
Re: oil temp sensor
Posted: Jan 30, 2008 2:34 PM   in response to: pete0621 in response to: pete0621
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Sorry, have had no personal experience with having to hunt
down wiring faults in that circuit... I'm simply going by
what the Bentley CD spits out when searching for oil temp
sensor info (be it picture or wiring diagram).

Have you got a scan tool with which you could monitor oil temp
via the instrument cluster?

I may have missed it, but does the oil temp start low and go
up to 225 or is it always at 225?

Message was edited by: FKH161

pete0621

Posts: 6
Registered: 01/22/08
Re: oil temp sensor
Posted: Jan 30, 2008 5:04 PM   in response to: FKH161 in response to: FKH161
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I don't have any scan tools except a low cost OBDII scanner.
Sorry that some critical background is missing. The gauge functions normally except that occasionally it shoots up to hear 350 when I know the oil is not that hot. In the case I previously cited, the oil temp was at 0 then rose normally as the engine warmed up. Over the years I've seen a boatload of unreliable level, temp, and pressure gauges, and in every case I can recall, a new sensor has been the cure. it's possible the gauge itself is bad, but I sincerely doubt it. I intend to visit a dealership and see if they can resolve this mystery of the hidden sensor. Thanks again for your interest.
FKH161

Posts: 7,611
Registered: 12/29/05
Re: oil temp sensor
Posted: Jan 31, 2008 7:02 PM   in response to: pete0621 in response to: pete0621
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Attachment oiltempsensor.jpg (95.7 KB)
Went looking at some other audi forums and found a note
about an oil temp sensor being located next to the front
crankshaft puller (driver side)... see attached image.

Have a look if your engine has a single wire sensor in that
area (might not be easily visible).

It would make sense to have a single wire sensor be the input
for the gauge... and the level/thermo sensor be the input for
the Instrument Cluster Control Unit.
FKH161

Posts: 7,611
Registered: 12/29/05
Re: oil temp sensor
Posted: Jan 31, 2008 7:11 PM   in response to: FKH161 in response to: FKH161
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Sure enough... just found it in the Bentley CD (see attached
image)! ;-)

My apologies to you and the thread starter!

When typing "Oil Temperature Sensor" in the Bentley Search
Field, the "thermal/level sensor" comes-up... so I assumed
that to be the only sensor.

Would be nice to know how adamj318 made out as well!
pete0621

Posts: 6
Registered: 01/22/08
Re: oil temp sensor
Posted: Jan 31, 2008 8:42 PM   in response to: FKH161 in response to: FKH161
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Thanks so much for your persistence. I had searched several forums and came up empty. I queried the techs at the Bentley manual and they wound up directing me to this forum. Funny, I did the timing belt thing a few months ago and don't recall seeing this sensor. I'm hoping now I don't have to take the front end off again to get at his silly thing. Regardless, your information should prove valuable to future users of this forum. I'm going to direct the Bentley manual folks to your information so they too have it at hand.

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