Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Outside Air Temperature Sensor -G17-, Removing And Installing
The measured value of the Outside Air Temperature Sensor -G17- is evaluated by the Vehicle Electrical System Control Module -J519- and is transmitted via the Data Bus to the Climatronic Control Module -J255- A/C display and control head (and the Instrument Cluster Control Module -J285-) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
The illustration shows the allocation of the Outside Air Temperature Sensor -G17- -A- on the Audi A5 Coupe, the Audi A5 Sportback, the Audi A4, Audi Q5, etc. The allocation can vary.
If the vehicle has an Outside Air Temperature Sensor -G17- -A- with the bracket -B- installed on the air intake grille above the impact member, it is possible that a higher temperature may register due to the component location of the Outside Air Temperature Sensor -G17- under certain operating conditions (because the radiator and condenser are radiating heat, for example on MY 2008 vehicles). In MY 2009, the component location of the Outside Air Temperature Sensor -G17- -A- has been moved as a running change. The Outside Air Temperature Sensor -G17- with the new bracket -C- have been move slightly forward (closer to the radiator grille) and is under the impact member -D-. Refer to the Parts Information.
If there is a complaint because the measured value is too high because the vehicle has the Outside Air Temperature Sensor -G17- -A- with the bracket -B- installed on the air intake grille above the impact member, then install an Outside Air Temperature Sensor -G17- -A- with the revised bracket -C- slightly forward (closer to the radiator grille) and under the impact member -D-. The wire connections may have to be lengthened. Refer to the Parts Information. The bracket -C- is clipped into the impact member -D-. It may be necessary to drill a 7 mm hole into the impact member -D-.
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Removing And Installing:
-- Turn off the ignition.
-- Remove the upper lock carrier cover. Refer to OVERVIEW - LOCK CARRIER .
-- Disconnect the connector -E- on the temperature sensor -A- and remove the temperature sensor from the bracket (-B- or -D-).
Depending on the vehicle equipment level, it may be necessary to remove the bumper in order to remove the Outside Air Temperature Sensor -G17- -A- from the bracket -C- installed under the impact member -D- (if, for example, the Outside Air Temperature Sensor -G17- is not accessible from above on vehicles with additional radiators).
-- After installing, check the DTC memory for the Climatronic Control Module -J255- display and control head (and the Instrument Cluster Control Module -J285-) and erase any faults, if necessary using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.