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WelshSue
Needs to get out more



Joined: Mar 21, 2010
Posts: 124
Location: Powys

PostPosted: Sat Jul 05, 2014 11:40 am Reply with quote Back to top

The Temp gauge on my 2003 A6 2.5TDi will suddenly drop from 90 down to just over 60 then back up again. Re seated the plug but still does it and has now brought up the engine management light. Is it the Coolant temp sender? If I replace myself will the diagnostics(engine management light) need to be reset? Thanks
 
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WelshSue
Needs to get out more



Joined: Mar 21, 2010
Posts: 124
Location: Powys

PostPosted: Tue Aug 05, 2014 7:14 pm Reply with quote Back to top

Now sorted, disconnected the battery for a few mins and now temp gauge/sender fine & engine management light off Very Happy
 
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WelshSue
Needs to get out more



Joined: Mar 21, 2010
Posts: 124
Location: Powys

PostPosted: Wed Feb 11, 2015 4:12 pm Reply with quote Back to top

Fault reappeared. This time replaced temp sensor. seemed ok until whilst out driving today went over a speed hump. The gauge then dropped to 60. Out with the trusty meter. Traced to wiring loom that passes under expansion tank. wiggling the wires the earth would disappear.(open circuit). found a break in the earth wire where it passes through the clamp on the engine. remade connection and ran car up to 90oC & rocked the car side to side & up & down. Seems to be fixed. Just been looking through the service book. The previous owner had the sensor changed 25k ago so maybe this problem has been on the car for a while??
 
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