Light Sensor message questions
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Joined: May 2019
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2004 C240 Wagon
Light Sensor message questions
My 04 C240 has the common "light Sensor-Drive to Workshop" message. After a bunch of reading here I replaced the battery hoping it would help. But alas, no luck. Without loading the parts cannon, is there a good definitive way to check the sensor is functioning properly? My guess is either the sensor itself, or possibly the voltage regulator. The regulator gets mentioned a bunch in what I have read. I have the Valeo alternator if that helps any.
Any input appreciated!
Any input appreciated!
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Joined: Dec 2003
Posts: 3,275
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From: BC, Canada
2003 C230K Coupe Orion Blue
Most likely the voltage regulator. See my thread on it here.
It can be DIYed by removing the alternator from the car, then replacing the VR which is attached to the alternator by a few screws.
Your alternator will be either a Bosch or Valeo. My understanding is your new VR must match the alternator brand. They are not interchangeable.
As for the sensor itself, I don't think anyone on this forum has ever posted about the sensor actually failing for the W203.
It can be DIYed by removing the alternator from the car, then replacing the VR which is attached to the alternator by a few screws.
Your alternator will be either a Bosch or Valeo. My understanding is your new VR must match the alternator brand. They are not interchangeable.
As for the sensor itself, I don't think anyone on this forum has ever posted about the sensor actually failing for the W203.
Last edited by slammer111; Jun 21, 2019 at 07:15 AM.
Thread Starter
Newbie
Joined: May 2019
Posts: 4
Likes: 0
2004 C240 Wagon
Most likely the voltage regulator. See my thread on it here.
It can be DIYed by removing the alternator from the car, then replacing the VR which is attached to the alternator by a few screws.
Your alternator will be either a Bosch or Valeo. My understanding is your new VR must match the alternator brand. They are not interchangeable.
As for the sensor itself, I don't think anyone on this forum has ever posted about the sensor actually failing for the W203.
It can be DIYed by removing the alternator from the car, then replacing the VR which is attached to the alternator by a few screws.
Your alternator will be either a Bosch or Valeo. My understanding is your new VR must match the alternator brand. They are not interchangeable.
As for the sensor itself, I don't think anyone on this forum has ever posted about the sensor actually failing for the W203.
Thanks for the info. That is what I was guessing/hoping as well. I found the OEM Valeo part on ebay for $38.00 so I will take a stab at that. I am doing the serpentine belt and tensioner now so it is the perfect time to tackle it!
