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Can anyone help with a sensor location??

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Can anyone help with a sensor location??

  #1  
Old 06-07-2019, 03:32 PM
1st Gear
Thread Starter
Join Date: Mar 2018
Location: NJ
Posts: 3
Default Can anyone help with a sensor location??

Hi,

I have a 2008 Q7 3.6 V6.

I need to locate one of the engine temp cooling sensors. I have been unable to find anything on the internet. Background:
  • I started having erratic temp gauge on the dash, then went to cold and stayed there. Cooling fans on high all the time and stay on after car is shut off.
  • Poor idling and missing (I assume due to low battery voltage)
  • Had erratic codes including P3081 and mis-communication/no communications with ECU. Sent ECU out for repair, shop says no physical damage but SW malfunction. Got ECU back, car runs better, no more ECU communication errors but still had P3081 low temp.
  • Replace coolant temp sensor in lower rad hose. Cleared code/MIL. Code and symptoms came back immediately.
I understand there is another engine coolant temp sensor in the engine compartment, but I have had no luck finding any information on where that location would be. I found the location and even DIY replacement procedure on every other Audi/VW engine except the 3.6!

Can anyone help!
 
  #2  
Old 06-08-2019, 12:33 PM
1st Gear
Thread Starter
Join Date: Mar 2018
Location: NJ
Posts: 3
Default

Update:

Went to the dealer this morning to see if I could get some info.

Parts guy said the temp gauge/low temp code is probably due to aftermarket part. He spoke to one of the techs who also confirmed the problem still exist due to aftermarket part. Purchased the OEM sensor for $70! Also printed me out a diagram and confirmed that on the 3.6 there is only 1 coolant temp sensor. Got home, popped it in, and...

Problem still exists! Code/MIL won't clear, MIL on, fans on all the time at high speed.

Anyone???
 
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