As title really, my external temp display is out by about 5-7 degrees at least all of the time when compared to other cars anybody know if this could just be the sensor or something more complicated?

Sounds like a faulty outside temp sensor.

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Try this. I found it on search when mine was faulty

Have you plugged VCDS into it as it might show why? I also pulled this from a workshop manual.

 

Testing ambient temperature sensor -Gl7-

 

Special tools, testers and aids required

 

- Hand-held multi-meter, e.g. V.A.G 1526 A

- Remove left ventilation grille.

- Take out ambient temperature sensor.

- Separate connector of ambient temperature sensor.

- Connect handheld multi-meter to the contacts of the ambient temperature sensor for resistance measurement.

 

Specifications:

 

Temperature Specification

-30⁰ C

Approx. 18265Ω

0⁰ C

Approx. 3300 Ω

20⁰ C

Approx. 1184 Ω

50⁰ C

Approx. 359 Ω

 

 

 

 

 

- lf that specification is not achieved, replace the ambient temperature sensor.

- lf the specification is achieved, then test the cable to the ambient temperature sensor.

- lf the specification for the resistance and the cable to the sensor are correct, then replace the dash panel insert.

 

Hope that helps in some way?