Parking sensors sometimes not working.
Thread Starter
Newbie
Joined: Sep 2022
Posts: 8
Likes: 0
From: Trivandrum, Kerala , India
Mercedes Benz E250 CDI ( W212 facelift)
Parking sensors sometimes not working.
I've recently bought a used w212 facelift E250 CDI. It's my first car, my first Mercedes , one of my biggest dreams, and the experience has been amazing so far. Loving the car to bits. I've just noticed a few little niggles that i hope i can sort out.
The parking sensors sometimes do not work. The 2 dots in the front and rear sensor indicators don't light up while reversing. Once i turn off the ignition and turn on the car again, they work fine. I don't think its a problem with the sensors, because if it works, the sensors detect all surrounding objects. Could it be an issue with the battery?
On another note, I've also noticed that the ECO mode sometimes doesn't work even though its switched on.
After buying the car, i gave it for interior detailing. While they were working on the car all day, all the interior lights were running in the background and the battery drained out. I had to jump start the car. But after that , there weren't any other issues other than these.
I hope someone can help me out
Thank you 😊
The parking sensors sometimes do not work. The 2 dots in the front and rear sensor indicators don't light up while reversing. Once i turn off the ignition and turn on the car again, they work fine. I don't think its a problem with the sensors, because if it works, the sensors detect all surrounding objects. Could it be an issue with the battery?
On another note, I've also noticed that the ECO mode sometimes doesn't work even though its switched on.
After buying the car, i gave it for interior detailing. While they were working on the car all day, all the interior lights were running in the background and the battery drained out. I had to jump start the car. But after that , there weren't any other issues other than these.
I hope someone can help me out
Thank you 😊
Banned
Joined: Oct 2005
Posts: 4,957
Likes: 1,640
As noted in several threads here, when experiencing problems with the ECO mode it is the main battery going south. This could also be affecting your Parktronic function. Check the SOC of the main battery. You want to see 12.6v or slightly less. If it’s in the low 12v or high 11v it needs replacement. You could try a trickle charger and see if you can condition it back. That doesn’t always work.
A bad sensor will also cause the issue you describe and you will need the proper diagnostic equipment to find it. I would start with the main battery and go from there.
A bad sensor will also cause the issue you describe and you will need the proper diagnostic equipment to find it. I would start with the main battery and go from there.
Thread Starter
Newbie
Joined: Sep 2022
Posts: 8
Likes: 0
From: Trivandrum, Kerala , India
Mercedes Benz E250 CDI ( W212 facelift)
. Check the SOC of the main battery. You want to see 12.6v or slightly less. If it’s in the low 12v or high 11v it needs replacement. You could try a trickle charger and see if you can condition it back. That doesn’t always work.
A bad sensor will also cause the issue you describe and you will need the proper diagnostic equipment to find it. I would start with the main battery and go from there.
A bad sensor will also cause the issue you describe and you will need the proper diagnostic equipment to find it. I would start with the main battery and go from there.
I had the car scanned during the routine service , and there were no fault codes on the sensors or the ECO mode issue.
Banned
Joined: Oct 2005
Posts: 4,957
Likes: 1,640
Swap the battery out as you would on any car. There is no magic to replacing a battery on these cars, other than they are heavy. You may have to do a window reset, which is simply to open and close the window while holding it at the stop for a couple seconds. That’s it.
