Please help a local S6 owner out.
01-23-2006, 09:32 PM
#1
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Please help a local S6 owner out.
A local S6 owner has been struggling with the oil pressure warning light in his autocheck for over a year now. He has had his oil pressure checked and it's just fine. He also had the oil pressure switch replaced (single wire with white insulation). The warning light would still come on seemingly at random. The shop told him that is was his autocheck system. Plausible, but he stopped by tonight and I swapped in my spare S6 instrument cluster. Still the random oil pressure warning light.
I was under the impression there was an oil pressure switch and a oil pressure sensor. On his car he was what the Bentley refers to as the oil pressure switch (single wire with white insulation), but instead of the two wire oil pressure sensor he just has a plug. This may be because he has no oil pressure gauge, but I thought the autocheck system used two oil pressure senders?
Does the S6 send two oil pressure signals to the instrument cluster or just one? If there is two, where is the second oil pressure sender?
Please help him out. I am amazed he hasn't punched a hole in his instrument cluster for the amount it beeps at him.
I was under the impression there was an oil pressure switch and a oil pressure sensor. On his car he was what the Bentley refers to as the oil pressure switch (single wire with white insulation), but instead of the two wire oil pressure sensor he just has a plug. This may be because he has no oil pressure gauge, but I thought the autocheck system used two oil pressure senders?
Does the S6 send two oil pressure signals to the instrument cluster or just one? If there is two, where is the second oil pressure sender?
Please help him out. I am amazed he hasn't punched a hole in his instrument cluster for the amount it beeps at him.
01-24-2006, 02:38 AM
#2
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Both sensors are in the block on the drivers side....
One is a bigger two wire sensor, with an approx. diameter of 2inches. The other is a tiny 1/2 job that blew up on me. It's directly above it and has a single wire going to it. When mine started gushing oil, my oil light came on. Perhaps the sensor was defective?
I was under the impression that the lower sensor doubles as an oil temp / oil pressure sensor, while the upper, smaller sensor is simply a switch for the oil light.
I was under the impression that the lower sensor doubles as an oil temp / oil pressure sensor, while the upper, smaller sensor is simply a switch for the oil light.
01-24-2006, 02:54 AM
#3
On a '94, there are two pressure switches and one pressure sender...
F 1 - 1.8 bar oil pressure switch
F 22 - 0.3 bar oil pressure switch
G 10 - Oil pressure sensor
G 8 - Oil temperature sensor
I seem to recall reading that the autocheck switches over from the 0.3 bar switch to the 1.8 bar switch at a particular RPM. I.e. you get an oil light if you are less than 0.3 bar at idle, or less than 1.8 bar at xxxx RPM.
I would think that a later car without the pressure gauge would still have two pressure switches.
F 22 - 0.3 bar oil pressure switch
G 10 - Oil pressure sensor
G 8 - Oil temperature sensor
I seem to recall reading that the autocheck switches over from the 0.3 bar switch to the 1.8 bar switch at a particular RPM. I.e. you get an oil light if you are less than 0.3 bar at idle, or less than 1.8 bar at xxxx RPM.
I would think that a later car without the pressure gauge would still have two pressure switches.
01-24-2006, 05:12 AM
#4
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the single switch is correct for the 95's Did he perhaps get the wrong switch.
This switch looks identical to those on the v6 100/200/a6's but is a different pressure rating... might be the issue. The correct part # is 068 919 081.
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01-24-2006, 07:57 PM
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Ummm. That's because the S6 has no oil pressure readout on the dash. It has a volt meter which takes
the place of the oil pressure gauge. This is why there is nothing there. Like someone said, it probably has a wrong single pin oil pressure switch that is rated for a lower/higher pressure. It's either that or a bad wire connection.
