Help! can't find Yaw rate sensor on W208 CLK 230 convertible

[Wyersmith]

LOADS of bolts. Your wrist will ache!

Other than that, not difficult. You can call me Susan if it isn't so.

haha, thanks! Let's hope it doesn't come to that! Will let you know how it goes.

Cheers

 

[Wyersmith]

You need to unbolt the metal plate with the felt on that you have mentioned. It is just behind there, on the floor, on the nearside. Should be plug and play. I've changed a couple of these before.

Hi Uncle Benz, Thanks very much for your tip on where to find the yaw sensor. You were dead right. It took a bit of working out how to get the roller boot cover off and out of the way and there was a lot of bolts and trim clips to remove but once the metal bulkhead was off the sensor was on the left where you said it would be. Now just got to find a replacement without shelling out £450 for a brand new one if I can help it!

I really appreciate all the help from everyone on this.

Cheers

Wyersmith

 

[Naraic]

Hi Uncle Benz, Thanks very much for your tip on where to find the yaw sensor. You were dead right. It took a bit of working out how to get the roller boot cover off and out of the way and there was a lot of bolts and trim clips to remove but once the metal bulkhead was off the sensor was on the left where you said it would be. Now just got to find a replacement without shelling out £450 for a brand new one if I can help it!

I really appreciate all the help from everyone on this.

Cheers

Wyersmith

What's the part number?

 

[Wyersmith]

Hi,

Part number is A0025429518

found some similar on ebay tonight, 2nd hand of course, but no exact matches. Was going to try Dronsfields tomorrow.

Any suggestions for other suppliers much appreciated. Found a new one discounted on Euromerc website but have read a few comments in various places saying that orders can sometimes not materialise. Not really ready to chance that with a £150 when I want to get back on the road asap.

Cheers

Wyersmith

 

[Wyersmith]

How to find the Yaw Rate Sensor on a 2000 CLK 230k Convertible

Hi,

I had some help from several peeps on this forum when trying to find the Yaw Rate sensor on my 2000 CLK 230k Convertible. If Uncle Benz hadn't pointed me in the right direction I may well have given up and resigned myself to a £600 bill from the MB garage. as it was I spent a couple of hours fiddling about with trim clips and nuts and bolts and fitted a 2nd hand part from Dronsfields for under £45. Happy bunny. Means I can sort out the handling problems on the Range Rover I've just bought. I know, what was I thinking?

Anyway, to return the favour, and just in case anyone else ever wants to find and change their own Yaw Rate sensor on a convertible CLK, here's how I did mine with a few pics to illustrate.











Open the boot and take out the boot floor panel.

Next remove the roller blind type cover which you pull across the boot space so that you can drop the roof. This was a bit fiddly but I ended up removing the bolts from above each end of the roller assembly (there's only one at the top of each but they are long), then removing the rails on each side, these are snap on with two screws at the back end and a couple of trim clip/studs in the tops of the runners (the trim clip/stud at the front end by the roller asembly is under some velcro - I have no idea why)

Once the roller cover is out that's the tricky part done.
Next remove the trim studs from around the bottom, sides and middle of the bulkhead. You don't need to take the top row out like i did (live and learn!) is it only me who finds these ****** trim clips finger tip killing painful to get out?
with the trim/felt off you will see a whole load of brass bolts. remove all of them from the lower panel of the bulkhead. If you lift up the upper piece of lining on the bulkhead you will see the top row of bolts which gives away that this is a two piece panel.

Once the panel is out the Yaw Rate sensor can be found on the left hand side of what must be the hydraulic system for the roof (?) and is bolted to the floor with two bolts just in front of another square brass/metal sensor which might be the acceleration sensor but don't take that as gospel.

Unclip the electrical connector by squeezing the sides, pop the new sensor in its place and put everything back.

Took me about 1.5 hours in total but most of that time was spent faffing about with the roller cover. certainly not a difficult job for DIY if I can do it and would probably be more like 30 mins for someone who knows what they are doing. Certainly not a 2 hour job as I was quoted at the MB garage.

I did read some messages elsewhere saying that once fitted you had to do some sort of initialising of the new unit (the MB specialist mentioned it too) but Uncle Benz assured me it was plug and play so I didn't worry about it. I've driven about 80 miles in it with the new sensor and it's been absolutely fine. No sudden braking on one wheel (phew) and no BAS ESP warning light. with luck that's one less thing to worry about.

As I said, thanks to all who've helped me with this, it has saved me about £550.00 by doing it myself.

Cheers all
Wyersmith

 

[Wyersmith]

we have a thread with 100's of replies where members post up their VIN for a decode, so I would say your safe enough to post it here. WIS doesnt seem to suggest it is anywhere else. I have a CAB also so used my VIN to check and just says the same thing as you have already seen.

Hi Miffy,

Sorry I don't know how to reply to PMs but I've added a few lines and pics of how I eventually fixed it at the end of this thread.

Cheers

Wyersmith

 

[Miffy]

its in DIY also, thanks for taking the time to come back with the info and some pics

 

[Uncle Benz]

Sounds like I've escaped being called Susan yet again!

 

[Jose Bush]

LOADS of bolts. Your wrist will ache!

Other than that, not difficult. You can call me Susan if it isn't so.

i have just got hold of a CLK 230 Cabriolet BAS and ESP light on have changes Brake light Switch no joy took it back to my garage they hooked it up to computer and said it was the lateral Acceleration module .
After reading these old threads I found the location and change the unit with one from Dronsfield still no joy ... any ideas

 

[Uncle Benz]

i have just got hold of a CLK 230 Cabriolet BAS and ESP light on have changes Brake light Switch no joy took it back to my garage they hooked it up to computer and said it was the lateral Acceleration module .
After reading these old threads I found the location and change the unit with one from Dronsfield still no joy ... any ideas

It's late, and I'm tired, but this thread concerns the yaw rate sensor, and you mention the lateral acceleration sensor. I'll check tomorrow, but it's possible that both are fitted to your car, and you may have changed the wrong one. From memory the lateral acceleration sensor is held down with a metal clip affair, whilst the yaw rate sensor is a slightly larger two bolt job.

 

[Uncle Benz]

You can see both in this picture. Black plastic boxes

 

[Jose Bush]

You can see both in this picture. Black plastic boxes

Hi Uncle Benz thanks for getting back to me ....yes it is the lateral acceleration module I changed the bracket is fitted to the studs that the yaw module sits on ..used this thread to find the location it was very helpful is this unit plug and play like the yaw module

 

[Uncle Benz]

It would be worth unplugging each of the two units, one at a time and then clearing and rechecking the fault codes to check that you have identified the correct unit to replace. I am also pretty certain that you would need to use a diagnostic machine to clear the fault code once it has been generated, and the fault will not self-clear like a wheel speed sensor does.

Also, don't rule out the fact that a secondhand sensor may also be faulty

 

[Jose Bush]

It would be worth unplugging each of the two units, one at a time and then clearing and rechecking the fault codes to check that you have identified the correct unit to replace. I am also pretty certain that you would need to use a diagnostic machine to clear the fault code once it has been generated, and the fault will not self-clear like a wheel speed sensor does.

Also, don't rule out the fact that a secondhand sensor may also be faulty

Thanks for that I will get it in to the garage for that. Fingers Crossed .
I cant thank you and this forum enough for helping me to locate the module.
Also left the bulkhead with only a handful of bolts in so I can access quickly until I have got to the bottom of it and cleared it

Regards Jose

 

[Uncle Benz]

Not a bad idea, there are a lot of bolts!

 

[Jose Bush]

Not a bad idea, there are a lot of bolts!

Hi Unlcle Benz
Back again, well the lateral acceleration module I changed was ok but still the warning lamps are on,the guy at the garage says its the ABS pump and control module N47/5. he reckoned about £800 for the part, and that it has to be coded to the car ??
The garage have not charged me a penny for this advice and help but I am wondering what my options are, I don't want to keep changing bits to find another bit needs replacing.

Hope you can shed a bit of light on this pardon the pun! or perhaps point me in the direction of someone in the club that can connect up to the cpu and assist or even tell me if its worth getting done . I live in West London

 

[Uncle Benz]

Hmm. I think a second opinion may be required. Who are the garage you have been using?

 

[Jose Bush]

Hmm. I think a second opinion may be required. Who are the garage you have been using?

Just a little outfit in Ealing not a main dealer

 

[umblecumbuz]

This may not be of help, but the ABS circuit also has a relay in it with some Mercs. On my son's ML163 all the relevant lights were on and limp mode, no cruise, etc - and we narrowed it down to the pump. Wrong. Chasing shadows, we found a faulty relay - changed it out and all was well again.

On my own S204 with the same symptoms it was unfortunately the pump itself!

Umble

 

[Jose Bush]

Hmm. I think a second opinion may be required. Who are the garage you have been using?

This may not be of help, but the ABS circuit also has a relay in it with some Mercs. On my son's ML163 all the relevant lights were on and limp mode, no cruise, etc - and we narrowed it down to the pump. Wrong. Chasing shadows, we found a faulty relay - changed it out and all was well again.

On my own S204 with the same symptoms it was unfortunately the pump itself!

Umble

Thanks for that info ... I have been given the name of a mobile mechanic teamm that specialise in Mercedes call Mercnix Any one know of them?