Mercedes Benz C124 W124 Coupe update OVP Relay replaced ABS light

[@avindutt6163]

So I recently bought a 1988 300E as it’s one of my top 5 favourite Mercedes however one day I was driving the car and it just shut off at a red light, everyone I asked on forums said it would be the relay and so I found this video to figure out how to fix it and you have been a major help, keep doing the amazing job you’re doing to help us oldschool Mercedes lovers❤️

[@PlanetautoUK]

Excellent news, they’ll be a video on repairing our rear window, just stopped working 😀 always a project, thank you Avin

[@jiridrozd3289]

Just fixed my W124 ABS! Thank you for this video, it pointed me to the OVP relay, so I removed it and tested - not working at all, not even clicking. Because Im used to fixing electronic stuff, I disassembled it and found broken solder joints on the pcb on the relay coil to pins... Multimeter made me sure that the relay is ok (80ohms directly on the coil, but > 1megaOhm on pins) so I resoldered the coil and about half of other solder joints, put the relay together, put it into car and... woala... no abs light anymore... Thank you again! :D

[@PlanetautoUK]

That’s awesome news, it’s crazy what the OVP relay affects, thank you Jiri

[@jiridrozd3289]

@@PlanetautoUK also it seems that it starts better with fixed relay, before the idle rpm was low when engine was cold and it was needed to press throttle a little bit, after - no such a thing...

[@PlanetautoUK]

@@jiridrozd3289 that’s what we found, it should also feel more responsive too

[@mjjj-x7r]

Great video -mechanic said needed new fuel pumps @$ 1300-I replaced the fuse in the OVP--FIXED IT. thanks so much A+++

[@PlanetautoUK]

Awesome, it’s amazing what this gets diagnosed as, thank you MJJJ

[@andrewfoster1316]

glad you got dorothy fixed and sounds sweet well as a merc can they always sound beefy. happy motoring

[@PlanetautoUK]

Thank you Andrew, I get to fix new HT’s over the weekend too

[@borntolate1]

Did you find any of line pins in the ECU out of line ? .

[@PlanetautoUK]

No, not one

[@borntolate1]

You need to get a plastic cover to stop water draining down on to the ECU and that nice OVP relay, She lokks good .

[@PlanetautoUK]

Ah ok, don’t think I’ve ever seen one, any idea where please? ECU is all good checked it last week, no rain running in terminals etc rust free 😀

[@borntolate1]

@@PlanetautoUK All W124 have the plastic shields .

[@PlanetautoUK]

I filmed this ages ago can you see one, or is it because I removed it?

[@borntolate1]

@@PlanetautoUK Well only you will knowif there was one on there to start with .So is she up and road wothy yet ?

[@borntolate1]

@@PlanetautoUK So is she running normal now ?

[@mattsbeamer]

I forgot to comment on this the other day. A great video a wonderful car, I can’t wait to see it in person.

[@PlanetautoUK]

Thank you Matt

[@aloismesure3600]

I have a 1988 W124 230CE with a difficult first start. The first start every day is hard but if I fire it up 5 mins later it is fine. It drives perfectly normal with all it's power. The first start is my only problem. Also battery and alternator are fine? Could this be an issue? It can' t be injection cause it runs fine, right?

[@PlanetautoUK]

That’s perplexing, we’d post the query in the W124 groups on Facebook - they’re a helpful bunch, thank you Alois

[@aammadmustafa5985]

Where did you guys order the ovp and what did it cost?

[@PlanetautoUK]

About 90 quid from Ulverston Mercedes Benz

[@aammadmustafa5985]

@@PlanetautoUK my ones kept cutting out sometimes and now is refusing to start. According to my research it either ovp or the Mas relay. I have a 300e 24v

[@PlanetautoUK]

Remove relay and see if there’s any difference, idling and driving - there was with ours

[@StuartOliver83]

Thanks

[@PlanetautoUK]

You’re welcome Stuart

[@erwinlightspeed1228]

I changed the ovp relay on my w124 and now it cranks but won't start. The previous one worked but the car had a rough idle

[@PlanetautoUK]

That makes no sense ours started and ran with it removed, is it definitely the right one?

[@erwinlightspeed1228]

@@PlanetautoUK The new one is part number 2015403745, the old one 897236000 but it looks identical. The "new" one was used so it's probably defect. Just switched back to the old one, the car runs fine. Didn't try to start without it, thought u needed it lol

[@PlanetautoUK]

Well that’s something, congrats - we bought ours direct from Mercedes Benz, well worth it

[@BerryBreaksAU]

I've just purchased an E260 (1989) and received a phone call from my partner saying the car has just shut off whilst driving on a freeway. She basically lost control of steering and the ability to break. The gentlemen that we purchased it off asked if we have a lot of keys on her keychain which she did so he asked her to remove those as they could be causing it. He said its not happened before and is happy to pay for any costs associated with this issue as we have had it for basically one day which his good of him. Long story short: have you heard of keys doing this as some sort of safety feature? I am suspecting it has something to do with the OVP after some googling. Bloody scary stuff for anyone involved with a car losing power/control.

[@PlanetautoUK]

It’s not the OVP ours ran for a month without one, and drove fine, it was a challenge to start and ticked over erratically - never heard of the key thing I’ve 5 keys and a fob on my bunch, the only way weight would do it is if if managed to turn they key - but a w124 ignition location would play to that- keep an eye on it.

[@BerryBreaksAU]

@@PlanetautoUK did you have the OVP removed completely? I spoke to a mechanic and they suggested its the OVP also. The previous owner is going to change it tomorrow. I'll let you know if that makes a difference.

[@PlanetautoUK]

Have you an ABS light on? I drove it a mile or so around the village - not as smooth acceleration no difference to brakes or steering

[@BerryBreaksAU]

@@PlanetautoUK no. Only the battery light turns on when it happens.

[@PlanetautoUK]

There was a permanent ABS light with the faulty OVP, keep us posted on what’s happening please, thank you

[@andreaskarlsson7506]

My 300 ce has bad starting and bad idle, but i have no abs light can it be this ovp maybe?

[@PlanetautoUK]

I would say remove it and try starting it, that’s how I tested it, the difference is very noticeable when removed if it works, thank you

[@Rocco_toscano]

Hi how much was the OVP relay from Merc dealership please, i also need one asap! Thanks

[@Rocco_toscano]

also, i removed the ovp relay and the car wont start at all. The problem i have is it takes 6 or 7 cranks in the morning to get the car going, and when it does finally get going its really lumpy for a bit like not running on all cylinders then its ok after a min..

[@Rocco_toscano]

i dont have the abs light on either.. unless somones taken the bulb out!..

[@PlanetautoUK]

Hi Rocco - it was about £80 (just check with Mercedes Benz local dealership parts department)

[@PlanetautoUK]

We could still drive ours without the OVP it just didn’t want to start. It’s not had a problem since we replaced it though 👍

[@Rocco_toscano]

@@PlanetautoUK thanks mate, I'll be giving them a call tomorrow 👍

[@realasmr538]

There used to be lady around Arnside way with exact same colour as this one wonder if it’s the same car 🤔🤔

[@PlanetautoUK]

It is the same car! We called her Lady Dorothy after her previous owner 👍 and we’ve completely restored the car

[@brianmilligan1787]

You should of rehearsed that BS maybe it was 2pm maybe it was not a SL Maybe it was lady Dorothy

[@PlanetautoUK]

Come again ? A little context 😏

[@adammurray741]

would ya ever think of instead off babbling on maybe say how much it cost where you bought it etc.

[@PlanetautoUK]

No,