Mercedes Benz W166 W204 W212 Sunlight headlight Sensor Module A1669007101 – Original Used Part
RM 250
Condition: Used (Original)At a Glance
- Mercedes Benz W166 W204 W212 Sunlight headlight Sensor Module A1669007101 – Original Used Part
- Part number: A1669007101
- Fits: Mercedes Benz W166 GLE-Class, Mercedes Benz W204 C-Class, Mercedes Benz W212 E-Class · confirm by chassis number before ordering
- Used Original · tested working
- RM 250 · final quote via WhatsApp
- M.S. Motor · Kuala Lumpur, Malaysia · ready stock
Diagnosis and Common Symptoms
The sunlight and headlight sensor module (A1669007101) is a dual-purpose component responsible for monitoring ambient light for the automatic headlamp system and measuring solar intensity for the Thermotronic climate control. When this sensor fails, the vehicle's convenience systems lose their "eyes." Common fault codes associated with this module include B12A1 (Sunlight Sensor Malfunction) or communication errors on the LIN bus.
Physical symptoms include:
- Automatic headlights staying on even in bright midday sun.
- Headlights failing to activate automatically when entering tunnels or during dusk.
- The climate control system blowing inconsistent air temperatures or failing to increase fan speed when the vehicle is in direct sunlight.
- "Light Sensor Drive to Workshop" or "Auto Light Inoperative" messages appearing on the instrument cluster.
Introduction
This Genuine used Sunlight and Headlight Sensor Module is an essential replacement for restoring the automated convenience features of your Mercedes Benz. Every unit is harvested from donor vehicles with intact glass and electrical systems to ensure the sensitive photo-diodes have not been compromised by environmental exposure. Our technicians subject these modules to diagnostic testing to confirm they communicate correctly with the Front SAM (Signal Acquisition Module). By choosing a Genuine part, you ensure that the light sensitivity thresholds match your vehicle's factory specifications perfectly.
Product Details
- Brand: Mercedes Benz
- Model Compatibility: W166 M-Class/GLE, W204 C-Class, W212 E-Class
- Part Name: Sunlight and Headlight Sensor Module
- Part Number: A1669007101
- Condition: Genuine Used (Tested Working)
- Notes: This is a high-sensitivity optical component. Please ensure your windshield is clean and free of cracks near the sensor mount for optimal performance after installation.
Frequently Asked Questions
What symptoms indicate failure?
The most frequent sign is the automatic headlight system becoming unresponsive, often defaulting to keeping the lights on at all times as a safety precaution. You may also notice the air conditioning feels less effective when driving toward the sun.
Does this require coding?
In the W166, W204, and W212 chassis, this sensor is typically a plug-and-play unit. While it does not usually require SCN coding, it is standard professional practice to clear any "Stored" fault codes in the Front SAM or Overhead Control Panel module to reset the system logic.
Is this original?
Yes. This is a Genuine Mercedes Benz factory component. Unlike aftermarket light sensors which often have incorrect resistance values and cause flickering or delayed activation, this Genuine part maintains the exact factory-spec reaction times.
Part price does not include installation. Our workshop can install for you, labour is charged separately and confirmed with you before any work starts.
We cannot diagnose your car over WhatsApp or photos. Not sure this part will solve your problem? Come for a workshop check, diagnosis fee RM180. If you proceed with the repair using our parts, the RM180 is offset into the labour charge. If you decide not to repair, only the RM180 applies.
All parts are tested and guaranteed to work. Whether a part solves your car's problem can only be confirmed by diagnosis.
Shipping: from Kuala Lumpur, West Malaysia ~RM50, East Malaysia ~RM80 (estimate, confirm via WhatsApp). Delivery 1-2 working days in secure anti-static packaging.
Warranty: 30-day exchange for control units, engines, gearboxes and other major parts; 14 days for small parts. Claims require proof of installation by a qualified workshop. No warranty for items opened, modified, or damaged by wrong installation.
Prices vary with stock and part condition. Final price via WhatsApp.
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