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Old 01-06-2013, 03:31 AM   #1
Sauer 1979 OP
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Tank sensor heating element malfunction

Hi Everyone,

Only new here hope I have posted in the correct spot!

I have a problem with my R1200GSA 2008 with the fuel gauge reading the correct level then 6 klms later starts flashing an yellow light and showing no fuel. Then after a minute is goes back to normal.

33 900 klms.

I hooked up the GS 911 and it came back with a error code 41 778, Tank sensor heating element malfunction.

I gather that it needs to be replaced.

Has anyone has any experience with this?

Cost to replace or just use the trip metres?

thanks
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Old 01-06-2013, 03:35 AM   #2
fayeslane
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Lots of people have had trouble with the sensor. Even when they are working they are not accurate within cooee -just use the trip meter.
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Old 01-07-2013, 12:29 AM   #3
farqhuar
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This is probably a dumb question, but why the farq do BMWs need to heat their farqhuin' fuel and then have a sensor to measure how hot it is?

If they didn't bother heating it in the first place then surely it would obviate the need for a sensor (i.e. yet another thing to go wrong)?
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Old 01-07-2013, 07:52 AM   #4
rvt
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Like this?

Quote:
Originally Posted by farqhuar View Post
This is probably a dumb question, but why the farq do BMWs need to heat their farqhuin' fuel and then have a sensor to measure how hot it is?

If they didn't bother heating it in the first place then surely it would obviate the need for a sensor (i.e. yet another thing to go wrong)?
Not sure if this is how BMW do it but check out this link: http://www.analog.com/library/analog...l_sensing.html

I'm guessing the heater part warms the sensor for a period, and the change of temperature measured by the sensor correlates with the fuel level. The more fuel covering the sensor, the more heat that is dissipated, so the change of temp for the heating period will be lower.

Mine is old school with the float and rheostat. Occasionally it gets confused, but works itself out.
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Old 01-07-2013, 02:48 PM   #5
sidetrack one
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Multiple threads on the subject over in G-Spot,Oilheads
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Old 01-09-2013, 02:42 AM   #6
WayneC1
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The error code given is simply an odd translation

BMW and others use a 2 or 3 part code (in hex which can then be decoded to decimal ) to indicate a fault. The first part indicates the location, the second part indicates the fault drawn from a standard list of possible faults so in this case the code has been converted to decimal and the first part is "tank sensor" and the second part is the fault in the component within the location "heating element" is simply a poor translation of a resistor or rheostat

There are some lists of the codes floating round the net and you can find some in the OBD/CAN specs
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