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C43 Problems and Solutions

Old 02-04-2014, 05:15 PM
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C43 Problems and Solutions

I recently ran into 3 issues that took me awhile searching and piecing together different solutions before I came to the right one so I thought I'd share a couple of my funny problems and the solutions that I finally found. I'm hoping this will make it easier for others to be able to search and find both the problem and solution in the same post. I have a 1998 C43.

1. My ABS/BAS light would come on randomly. If it lit up it was generally soon after I started driving after startup. The solution was the brake light switch that sits under the brake pedal. If you have this problem and you feel like the brake pedal is a little squishy then the brake light switch is probably the issue. As soon as I replaced the brake light switch, I can tell that the brake pedal is firmer and the light doesn't turn on anymore. No special tools needed to change the brake light switch.

2. Once in awhile my C43 would just shut off while waiting at a stop light. When it happens sometimes it starts back up on the first crank and sometimes it would take awhile. Also if I stopped for lunch and 30-60 mins later try to start again it won't start for awhile. I would have to try multiple times before it started. I changed the fuel filter first and that didn't work. The solution was the crank position sensor. You'll need an 8mm torx SOCKET and a few swiveling socket adapters to be able to reach the 1 torx screw that holds the sensor in place. See here

3. When filling up the gas, the fuel pump handle would stop pumping even though the tank isn't filled at all. This seemed to have gotten fixed after I changed the fuel filter. I'll need to test it a few more times and I'll update this after I confirm it.

Hope this helps you all! And if you have other problems with solutions that you can add into a single post please feel free to post it up.
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Old 02-04-2014, 10:13 PM
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Now this is how you do a thread. Cataloging information for future readers!

I can tell you on number 3:

I've had 3 W202's. They all did that. My 1994 C280 did it for the 13 years I had it. Both my current C43's do it.

My only fix was to pull the nozzle out a little bit and let it fill up. Instead of shoving it in all the way and pulling the handle, I put it in only about 2 inches and let it hang, then pull the handle.
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Old 02-04-2014, 11:22 PM
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Isn't there something with the charcoal / fuel canister that has to be replaced for #3. I feel like we've been over this issue already!
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Old 02-05-2014, 06:34 AM
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hi guys

you have to tilt the handle/nozzle if gas stops pumping, sometimes it shuts off by itself randomly then you have to adjust the angle of pump handle gas keeps pumping.
it's an automatic shut off safety device
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Old 02-05-2014, 08:27 AM
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Regarding no.1 I have had the ABS/BAS light come up randomly on long trips. When I pull over for a short break and then start it up again, it doesn't come up... Weird :/ Only happen 3 times I think.

PS thanks for the tips
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Old 02-05-2014, 05:21 PM
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Yes these problems seem fairly common so I'm sure you've probably been through this before but usually I have to scroll all around a thread to find "possible solutions." I wanted to try and keep it concise so you wouldn't have to search thru each thread to find answers.

As for #3, sometimes it doesn't matter what angle/how far in the nozzle is. The fuel keeps cutting off. I had to basically slowly fill up the gas. But since I changed the fuel filter I don't seem to have the problem. Maybe it was a little clogged and made the pressure build up.
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Old 02-05-2014, 05:31 PM
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Check this thread out for the fuel nozzle issue: https://mbworld.org/forums/c36-amg-c...al-filter.html
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Old 02-05-2014, 06:33 PM
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Originally Posted by AMG Rage View Post
Yes these problems seem fairly common so I'm sure you've probably been through this before but usually I have to scroll all around a thread to find "possible solutions." I wanted to try and keep it concise so you wouldn't have to search thru each thread to find answers.

As for #3, sometimes it doesn't matter what angle/how far in the nozzle is. The fuel keeps cutting off. I had to basically slowly fill up the gas. But since I changed the fuel filter I don't seem to have the problem. Maybe it was a little clogged and made the pressure build up.
there's a sensor in the gastank when you hit a certain volume of gas, then pump will cut off not to overfill.
replacing fuel filter doesn't have anything to do with the gas-handlegrip nozzle cutting off.

sumetimes pump is cutting off by itself, you have to angle the handlegrip nozzle and squeeze the trigger to pump gas, this is only a safety blocker not to overfill
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Old 01-09-2019, 01:12 AM
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C43 1999 mysterious problems

Originally Posted by AMG Rage View Post
I recently ran into 3 issues that took me awhile searching and piecing together different solutions before I came to the right one so I thought I'd share a couple of my funny problems and the solutions that I finally found. I'm hoping this will make it easier for others to be able to search and find both the problem and solution in the same post. I have a 1998 C43.

1. My ABS/BAS light would come on randomly. If it lit up it was generally soon after I started driving after startup. The solution was the brake light switch that sits under the brake pedal. If you have this problem and you feel like the brake pedal is a little squishy then the brake light switch is probably the issue. As soon as I replaced the brake light switch, I can tell that the brake pedal is firmer and the light doesn't turn on anymore. No special tools needed to change the brake light switch.

2. Once in awhile my C43 would just shut off while waiting at a stop light. When it happens sometimes it starts back up on the first crank and sometimes it would take awhile. Also if I stopped for lunch and 30-60 mins later try to start again it won't start for awhile. I would have to try multiple times before it started. I changed the fuel filter first and that didn't work. The solution was the crank position sensor. You'll need an 8mm torx SOCKET and a few swiveling socket adapters to be able to reach the 1 torx screw that holds the sensor in place. See here

3. When filling up the gas, the fuel pump handle would stop pumping even though the tank isn't filled at all. This seemed to have gotten fixed after I changed the fuel filter. I'll need to test it a few more times and I'll update this after I confirm it.

Hope this helps you all! And if you have other problems with solutions that you can add into a single post please feel free to post it up.
hi,
i have a 1999 c43 amg and it has some interesting issues
so the car runs smooth and powerfull but once i come to a stop at like a red light or any place where i would stop
the car will start vibrating and if i want to resume my journey the car lost its power as in i would accelerate but it wont have any power
feels like the engine miss firing like when i stop the car. Few cylinders shut down and then the car is weak and starts shaking all along the way. Now the interesting this is
that if i were to turn the car off and turn it on and then drive straight away
the car is normal again
everytime it starts to do this at a stop light i just usually. Wait for it to be green and start the engine again and drive
and then all is good ,smooth and powerfull.
im really curious what this could be
as i changed all the plugs and coils as well .
I thought maybe it can be the airflow sensor so i unplugged it to see any change but it was the same.
any help would be greatly appreciated
thank you.
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Old 01-09-2019, 03:54 AM
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Originally Posted by Kerim A View Post


hi,
i have a 1999 c43 amg and it has some interesting issues
so the car runs smooth and powerfull but once i come to a stop at like a red light or any place where i would stop
the car will start vibrating and if i want to resume my journey the car lost its power as in i would accelerate but it wont have any power
feels like the engine miss firing like when i stop the car. Few cylinders shut down and then the car is weak and starts shaking all along the way. Now the interesting this is
that if i were to turn the car off and turn it on and then drive straight away
the car is normal again
everytime it starts to do this at a stop light i just usually. Wait for it to be green and start the engine again and drive
and then all is good ,smooth and powerfull.
im really curious what this could be
as i changed all the plugs and coils as well .
I thought maybe it can be the airflow sensor so i unplugged it to see any change but it was the same.
any help would be greatly appreciated
thank you.

Hi Kerim,

As this is your first post, welcome aboard this forum.

The symptoms you describe can be caused by several problems: air leak, faulty MAF, clogged fuel filter, etc. My recommendation would be for you to get the vehicle scanned to detect error codes which will point out the faulty area(s) which need to be fixed. IMO this is a starting point which will give you a health report of the condition of your engine and transmission. Better than searching in the dark and investing in parts which may not be necessary.

Keep us informed of your findings.
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Old 01-09-2019, 06:18 AM
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Originally Posted by DRBC43AMG View Post
Hi Kerim,

As this is your first post, welcome aboard this forum.

The symptoms you describe can be caused by several problems: air leak, faulty MAF, clogged fuel filter, etc. My recommendation would be for you to get the vehicle scanned to detect error codes which will point out the faulty area(s) which need to be fixed. IMO this is a starting point which will give you a health report of the condition of your engine and transmission. Better than searching in the dark and investing in parts which may not be necessary.

Keep us informed of your findings.
Thank you for the reply,
i will go to the garage today and scan the car for codes and update what i found.btw i was searching for the place where the scanner would normally connect to the car
on the bottom left corner but couldnt find anything.
i also have one more interesting finding
that some component seems to be missing from the engine bay

This is where there is something that seems to be absent
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Old 01-09-2019, 07:00 AM
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What's is missing is the airpump used for emission control. If your vehicle is a non N.America version, that's normal you don't have it. Regarding the OBD port, you'll find it in the engine bay at the rear passenger side against the bulkhead. It is not a regular plug and you need a special 30 something pin plug. I may have some photos at home... I'll check when I get back
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Old 01-09-2019, 06:24 PM
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As DRBC43AMG stated.



OBDII 38 pin location - NA benz PS engine compartment backside /firewall
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Old 01-09-2019, 06:31 PM
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Thanks Khomer2 you beat me to it. Ah I see a multiplexer what diagnosis software are you using? Carsoft perhaps? If so it's like mine

Just realized that the photo is my vehicle Didn't notice until I saw the orange spots on the casing and plug side which I added to make connecting easier

Last edited by DRBC43AMG; 01-11-2019 at 05:09 AM. Reason: Completed and corrected post
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Old 01-09-2019, 07:07 PM
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Originally Posted by DRBC43AMG View Post
Thanks Khomer2 you beat me to it. Ah I see a multiplexer what diagnosis software are you using? Carsoft perhaps? If so it's like mine

Just realized that the photo is my vehicle Didn't realize until I saw the orange spots on the casing and plug size which I added to make connecting easier
Just on a coffee break. Had to clear my mind with all the BS that satellite management has on the other-side of the country.

Yep to carsoft
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Old 01-12-2019, 10:41 AM
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Originally Posted by DRBC43AMG View Post
Hi Kerim,

As this is your first post, welcome aboard this forum.

The symptoms you describe can be caused by several problems: air leak, faulty MAF, clogged fuel filter, etc. My recommendation would be for you to get the vehicle scanned to detect error codes which will point out the faulty area(s) which need to be fixed. IMO this is a starting point which will give you a health report of the condition of your engine and transmission. Better than searching in the dark and investing in parts which may not be necessary.

Keep us informed of your findings.
i came to the garage to scan the car and we got 10 fault codes for missfiring in different cylinders
the mechanic told me we need to change the ecu but he doesnt have much idea about the car so im not feeling so confident.
i attached a list of the codes that i got
hope its not too bad tho
cant wait to drive again with full power😁
but to me the fact that i turn off the car and then turn it on and drive straight away with no issues , doesnt make sense.
today at a stop light the car was vibrating so much almost as if it is about to choke and turn off.



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Old 01-12-2019, 10:59 AM
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I'll check the codes in a moment when I have access to a larger screen , but I doubt the ECU is shot. I certainly wouldn't fall for that excuse.
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Old 01-12-2019, 01:15 PM
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Kerim A,
Start by cleaning your MAF with some CRC MAF cleaner (easy procedure). I would also throw in some seafoam as a nice treat for your baby. 2/3 of the bottle thru the brake booster vacuum line (will need a friend to keep the revs up) and do this in the open, well ventilated. Your going to get alot of white smoke and possibly a CEL and a few codes, but these should disappear.
The rest into the gas tank.
I highly recommend your buy yourself a scanner, if you havent done so, as you mentioned you went to a garage. Help you save some money as will need to scan, (in future again).
There's plenty of write-up on these specific topics here on the forum.

Have you checked your cats - they may be clogged.
Also what about your plug wires/ ignition coils (last time you swapped them)?
HAve you checked for any vacuum leaks (long shot)?
These codes you produced do point to these potential issues and a few others, but just pointing out what I consider the simplier checks.

Last edited by khomer2; 01-12-2019 at 01:18 PM.
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Old 01-12-2019, 01:42 PM
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You seem to be having trouble in one bank of cylinders 1 to 4 (the left side when facing the engine from the front, or passenger side if you are with a LHD vehicle) and a O sensor also on the left side which could be on the brink. Personally I would clear all the codes so you start with a clean slate and then see which ones come back up to the surface and work from there.

Have you checked all the connectors to the coils and the 8 plugs on the left side? I would also pull a plug from #1 (easiest access) just to see what's the condition on the end.

Regarding a scanner, you first need the 38pin plug (check e-bay) with a Bluetooth adaptor. You can then use an application with your smartphone which will read the codes. To erase simple codes the app will work, but with others you will need a more sophisticated scanner.

I have this one on my smartphone https://torque-bhp.com/ but don't use it any more as I have a more complete diagnostic programme
This is the 38 pin connector with a OBD plug on the other end which you will need: https://www.ebay.com/itm/OBDII-16-Pi...kAAOSwJAtZOD9w
Never mind if it mentions for SPRINTER models, it works perfectly on all the MBs with the 38 pin plug

If you like reading, this is a mine of very interesting info and tech solutions. It was prepared by a member on this MBWorld forum. Goes by the handle MarcusF
https://www.fitzhughmedia.com/MBF/index.html

Keep us informed of your investigations.

Last edited by DRBC43AMG; 01-12-2019 at 02:04 PM. Reason: Edited to complete and add links
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Old 01-12-2019, 02:21 PM
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Seems like you have an issue with one of your two o2 sensors?

The oxygen sensors are guaranteed by Bosh to last 100,000 miles but will wear or fail earlier?
Depending on your mileage, KM or miles, what is the mileage?
Some cars are fitted with only 2 sensors where US cars probably had 4 of them, maybe those C43 with smog pump, but not sure about this?
Someone else has to confirm this?

I see you attached photo of the engine room, you don't have the black smog pump which is great for you.
One less headache to worry about!

I don't know if you are from Europe or USA, so we don't know what market your car was intended for?
Where is your location?
Do you know if your rear cats are plugged for rear o2 sensors?

My car has only 2 front oxygen sensors and the rear cats are plugged for rear oxygen sensors.
Try to buy new sensors and swap them, it will do miracles for your cars performance.
They are not cheap from $tealership.
Buy aftermarket Bosch from any autoparts shop or on the web for massive discount.

Let us know what happened.
God speed!
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