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.
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HOMESERVICE MANUALSAUDI2012A3 (8PA) L4-2.0L TURBO (CCTA)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGSOLAR SENSORSERVICE AND REPAIR
2012 Audi A3 (8PA) L4-2.0L Turbo (CCTA)
Solar Sensor: Service and Repair
2012 Audi A3 (8PA) L4-2.0L Turbo (CCTA)SECTION Service and Repair
Sunlight Photo Sensor (G107)
• As a running change beginning in 11.2003, a modified sunlight photo sensor and a modified Climatronic control module (J255). Only sunlight photo sensor with part number 4E0 907 539 must have been/must be installed for Climatronic control module with part number without or up to index C. Only sunlight photo sensor with part number 8P0 907 539 must have been/must be installed for Climatronic control module with part number beginning with index D. Refer to the Electronic Parts Catalog.
• If the allocation between the sunlight photo sensor and the Climatronic control module is incorrect, the Climatronic control module cannot evaluate the signal from the sunlight photo sensor and the A/C system control will malfunction.
• No sunlight photo sensor is installed on vehicles with manually regulated A/C system.
- Switch off ignition.
- Carefully pry cover - A - out of front windshield defroster vent.
- Carefully pry sunlight photo sensor - B - out of front windshield defroster vent.
- Disconnect connector - C -.
• Do not interchange sunlight photo sensor - B - (4 electrical connections) with light emitting diode for central locking system and interior monitoring system - D - (2 electrical connections).
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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.