stanleytli

Hi,
I have a problem with outside temp.
I replaced outside temp. sensor, but problem still exist.
Any sugestions welcome.
Thanks in advance

Please see the youtube video

Edd W

I guess the 13°C was about right to start off with for last night as we had about the same in England.

Do all the other instruments work correctly?

I would suspect a CPU fault in the instrument cluster assuming that is where the thermistor feed goes to?

stanleytli

Hi, thanks for reply.
The other instruments seems to work corectly.
How to fix this problem, maybe something wrong with wirewing.
Thanks

stanleytli

Hi, I checked both sensors G17 and G89 and both are Ok.
What other checks I suppose to do.
Thanks

stanleytli

Address 08: Auto HVAC (4L0 910 043 )

02:05:22 Group 018
28.0°C Temperature
27.0°C Temperature
26.0°C Temperature
26.0°C Temperature

02:05:22 Group 019
22.0°C Temperature
-4.0°C Temperature
18.0°C Temperature
Not Occup.

02:05:22 Group 020
23.0°C Temperature
2880 /min RPM
38.0°C Temperature
OFF

Edd W

Does the HVAC system work normally - cooling and heating properly?

stanleytli

Hi Edd,
I think I found the problem, I removed sensor G89 and temp is OK.
It looks that fresh air intake sensor is faulty, showing wrong temperature.

stanleytli

Now I can confirm faulty G89 sensor.
Replaced with new one and all is working perfect.

Lion Heart

Just to let people know, the part number for the 'G89' sensor is:

1K0 907 543 A thru G

Older Q7's will have the original 'A' version. This has been superseded and now if you go to Audi and your car had an 'A' from factroy they will sell you the 'G' which is the latest version (the letter at the end is just a revision code). So, the letter at the end should make no difference if you are buying a used one, just get any one you can and should work fine. The 1K0 907 543 is the important part.

Hope that helps!

ptitchuisse

Hello
I just bought a Q7 2008 4.2 and have exactly the same issue.
Is there an easy way to locate the G89 sensor so I can confirm same diagnostic and change it?

or is this dealership kind of thing?

pretty handy but never touch a car except tires and oil change

thank you