Mercedes-Benz Forum banner

1 - 12 of 12 Posts

·
Registered
W164 GL450, W221 S550, R230 SL600TT, R170 SLK230, W140 S500, More
Joined
·
792 Posts
Discussion Starter #1
Does an R230 have a sensor that tells the car the hood is closed or open? My 2007 SL550 gives a red notification on the dash cluster at speeds around 85MPH or more, that the hood is not shut all the way and needs to be closed. The hood is shut correctly, and hasn't become open at all. I'm assuming that there's a sensor that I could replace near the front of the car? I don't spend a lot of time at those speeds, but when I do, I don't want red warnings popping up on the cluster!! It is a heavy hood and I drop it shut from about 12-16 inches, it clearly is shut all the way. My SL600 gave this warning once or twice as well, but only a few times and never bothered me again...
 

·
Premium Member
2006 SL600
Joined
·
36 Posts
Yes, just confirming there is a sensor. I get the same error occasionally, immediately after I close the hood. I pull over and open and close the hood again and it usually goes away. I haven’t bothered looking for the sensor though, so I can’t tell you where it is.
 

·
Registered
W164 GL450, W221 S550, R230 SL600TT, R170 SLK230, W140 S500, More
Joined
·
792 Posts
Discussion Starter #3 (Edited)
A little research shows that it appears to be a part number
2308210351
For 2003-2012 SL's and it's located on the passenger side of the hood latch. Cost around $20-50 depending where you look. Since it's such an inexpensive part, maybe I'll buy one and then see if I still get warnings.
 

·
Premium Member
2006 SL600
Joined
·
36 Posts
Thanks! Would you mind posting a pic of the sensor location when you replace it? It’s probably obvious, but I briefly looked for it before and didn’t see it.
 

·
Registered
2003 SL500 USA model, Auto Transmission, Stock, Aegean Blue Metallic
Joined
·
1,425 Posts
The sensors are wired to the female front hood latches. After I re-aligned my hood, the light came on. I sprayed some lubricant in there, loosened, jiggled, and re-tightened the latch bolts, stood on 1 foot, and grinned... end of problem.
 
  • Like
Reactions: tonylinc

·
Registered
W164 GL450, W221 S550, R230 SL600TT, R170 SLK230, W140 S500, More
Joined
·
792 Posts
Discussion Starter #7
I looked around in there, behind the grill, in front of the radiator, didn't see anything. I always buy parts before figuring out how to put them on the car! Maybe removing the grill will make it clear to see. I only bought one though. TWO?! These hoods are so heavy there is no speed that could ever make them fly up, I wonder why it even matters if it weren't closed all the way.
 

·
Registered
2003 SL55; 2008 S550
Joined
·
465 Posts
Might just need a skillfully placed washer, or a tab slightly bent in order for the switch to register when it is closed.
And this repair would be free.
Sorry I cant be more help as I have never had this issue.
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550 FORMER: C300, ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,534 Posts
On mine, I discovered that the Bowden cable for the release lever under the dash is binding. That lever doesn't always return to it's position and leaves tension on the cable. When the hood is closed, it will act like it has fully dropped, but the release is just slightly loose and it will trigger the hood open light. I just have to remember to push the lever fully down after pulling it to open the hood.
 

·
Registered
W164 GL450, W221 S550, R230 SL600TT, R170 SLK230, W140 S500, More
Joined
·
792 Posts
Discussion Starter #10
Ha, That's a bit cheaper than buying a replacement part! I will have to give that a try.
 

·
Registered
W164 GL450, W221 S550, R230 SL600TT, R170 SLK230, W140 S500, More
Joined
·
792 Posts
Discussion Starter #12
It really may be as simple as pushing the hood release lever back into position when pulling it to release the hood. I noticed today when I opened the hood, the lever didn't go back forward all the way and when I pushed it a little it did go forward. So I will try that first. I wonder why the car would only start telling me the hood "Isn't shut right" at high speeds. I was unaware there were two sensors, what overkill! Actually I think that even having one is overkill; I don't think there is any way on earth that the hood could ever lift up like the hoods of the cars of the 1950s and 1960s could. I actually had a 1963 Ford Galaxie 500 that did just that, at 80MPH! I can't imagine with the R230's coefficient of drag, and aerodynamics, that the hood of any R230 could ever fly up. But, maybe it's possible. Maybe pushing the lever forward is all that's needed, and I can send back the sensor I bought.
 
1 - 12 of 12 Posts
Top