Mercedes W204 rear parking sensor issue?

Peter88

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I recently had a wee bump on my 13 plate W204 C Class Mercedes. I reversed into a barrier causing damage to the rear bumper. I got the bumper repaired and resprayed. The rear parking sensors stopped working after the collision (two red lights either side of parktronic gauge when car goes in reverse). I got the sensor replaced when the bumper was getting sprayed and repaired. I am still getting the same error when putting the car in to reverse. My question is do I need a diagnostic machine to reset the parking sensor? Or is it just a case of replace the broken sensor and it should work?
 

AMGeed

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The sensor is plug and play with no programming required.
Was more than one sensor possibly damaged without your knowledge?

I would have it diagnosed at a Mercedes independant who should be able to pinpoint the exact problem.
Whereabouts are you located so someone may be able to recommend a good indy?
 
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Peter88

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Yeah possibly more than one was damaged never thought of that, located at the very far north of Scotland.
 

AMGeed

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Sorry, wrong end of the country for me Peter.
That would be my guess, a different sensor is faulty as well but only live diagnosis will pinpoint it.
Hopefully a Scots member may know of somewhere nearby.
 
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Peter88

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Sorry, wrong end of the country for me Peter.
That would be my guess, a different sensor is faulty as well but only live diagnosis will pinpoint it.
Hopefully a Scots member may know of somewhere nearby.
Appreciate the help.

I also changed the right hand tail light as it was slightly broken. I am getting a “right hand tail lamp/brake lamp” message up on the dash. I’ve checked the right side indicator, brake lights, reversing light etc and all work fine. Any idea what the issue may be?
 

AMGeed

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Can't really help with that one Peter.
Maybe the message needs clearing with a code reader or Mercedes Star.
 
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Peter88

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I recently had to change my rear right tail light due to a collision on my 13 plate W204 C Class. I am getting a “right hand tail lamp/brake lamp” message up on the dash. I’ve checked the right side indicator, brake lights, reversing light etc and all work fine. Any idea what the issue may be?
 
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Peter88

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I’ll post the question to see if anyone has any ideas, cheers pal.
 

Uncle Benz

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Appreciate the help.

I also changed the right hand tail light as it was slightly broken. I am getting a “right hand tail lamp/brake lamp” message up on the dash. I’ve checked the right side indicator, brake lights, reversing light etc and all work fine. Any idea what the issue may be?

examine the electrical connector plug. They are very common for burning the earth pin. The burned connection gives a high resistance which fools the bulb failure warning even though the bulbs are working
 

JBell

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Star or Delphi diagnosis will tell you which sensor is faulty, they are numbered starting on the front passenger corner. Easy to change as you can reach them under the bumper
 
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Peter88

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Star or Delphi diagnosis will tell you which sensor is faulty, they are numbered starting on the front passenger corner. Easy to change as you can reach them under the bumper
I’ve got an iCarsoft ordered will that do the trick? So they will be able to be changed without taking the rear bumper off?
 

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Hello and welcome

Ive merged your threads and taken the “fear” out of the title :cool:
 

JBell

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I’ve got an iCarsoft ordered will that do the trick? So they will be able to be changed without taking the rear bumper off?

I think so.

Yes you can reach them, they are plug and play and very easy to change
 
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Peter88

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Thanks I’ll have a look. I’ve looked at the electrical connectors on tail light and attached photos of what I found. Am I able to just change the black plug connector? If so how do the wires comes out of the connector or do they need to be cut?
 

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Uncle Benz

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There is a “field repair” you can do with a length of cable, ring tag terminal, self tapping screw and scotchlock. The earth terminal runs round to every bulb on the outer case. Locate a suitable location on the metal track and drill a small hole. Attach the ring tag terminal with the screw. Scotchlock the other end of the cable to the earth wire before the plug. Will keep you going until such time as you buy a repair kit and new bulb holder. I have a couple of customers who’ve been running on the field repair for years!
 
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Peter88

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There is a “field repair” you can do with a length of cable, ring tag terminal, self tapping screw and scotchlock. The earth terminal runs round to every bulb on the outer case. Locate a suitable location on the metal track and drill a small hole. Attach the ring tag terminal with the screw. Scotchlock the other end of the cable to the earth wire before the plug. Will keep you going until such time as you buy a repair kit and new bulb holder. I have a couple of customers who’ve been running on the field repair for years!
Perfect thanks for your help. Noticing that it is a common fault going by some videos on YouTube.
 
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Peter88

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I think so.

Yes you can reach them, they are plug and play and very easy to change
Apologies for pestering you again but having seen some videos on YouTube etc, Can you defo reach the parking sensors without removing rear bumper and diffuser? Thanks for the help.
 

JBell

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Apologies for pestering you again but having seen some videos on YouTube etc, Can you defo reach the parking sensors without removing rear bumper and diffuser? Thanks for the help.

Yes, it is fiddly but very doable. It would be a good idea to clean the whole area out as well as they do fill up with crud
 
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Peter88

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Yes, it is fiddly but very doable. It would be a good idea to clean the whole area out as well as they do fill up with crud
Thanks again pal
 


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