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My E350 was fine for the last 3 years without any issues. It is 150k miles now. Recently from 1 month ago, I have replaced my sparks plugs as precautions and service(last spark plugs was on 104k miles). After replacing plugs by 2 weeks, I get my first CEL with low car performance and little shaking. I turned off the car then star again, everything was fine and normal. I got my Autel scanner, but now errors at all. Then, after 1 month(Last Sunday) CEL blink back some times steady and sometimes flashing under acceleration. Car shaking hardly and no performance. I moved the car to MB service center for check up. They mentioned that we get the following errors. Checked fault codes and hade 0087 low fuel pressure.
Missfire over 2 and 3 cylinder.
They said thay, need to replace my fuel pump and he said that there is filter with pump and néed to replace the filter on the second side.
Dealer told me that process with OEM Pump around 840$ or he will buy new hella pump for 220$. And secondary filter need replacement the one on. The other side of fuek resevoir.
Che k your scan tool for cylinders with misfires. Swap the coils from those cylinders to cylinders without misfires. Restart and check if misfire stayed at the same cylinders, or if it (they) moved with the coil(s).
By 150k, I’d replaced 5 of the 6 coils due to the same symptoms. I keep a couple around, awaiting the next one…
Thank you all.
Our local Mercedes dealer has two service center. The first one it is for only Benz cars and for sure only Benz parts. Second center it is for all car models and you can choose OEM parts or Magne Marelli parts or other reputable vendors.
He told that everything about coils and Sparks(All sparks replaced last month with Benz sparks plugs + 2 plastic joint) are good and the Missfire related to low fuel pressure error (Not sure if he is correct but it is the dealer). He didn't mention about High full pump. But at least he said that after replacing the LFP pump and fitler with assembly, the error fixed and no any codes. He did all testing as he said (long trip, cold start and warm start).
Note: Fuel filter never replaced since I see Service booklet mentioned that every 250000 KM interval so I was waiting for next service to replace but could be only the issue or it damaged my pump.
Is Hella Pumps reliable and what is your expectation for Fuel pump mileage if it is OEM or after market one?
My local MB dealer will install parts I supply, which I was actually surprised when I asked. I had them replace a passenger side exhaust manifold that I could not do myself and I already had all the parts.
The maintenance manual for my W204 M272 engine says to replace the fuel filter at 15yrs/150,000 miles. Im at over 160,000 miles now and havent done it yet since so far fuel pressure appears fine when I check with my Foxwell scanner. Fuel filter is actually the only maintenance item I havent done and is not up to date. When I look up part #'s I noticed mine is different due to it being a PZEV spec (917).
The Maintenance Manual for my car is in the zipper case along with the Operators Manual in the glove box.
I get back the car, everything looks good thanks god. They share the invoice with replacing the Low Fuel Pump with Partnumber 8tf358304411(210$ cost) and Fuel Filter(80$ cost) with part number mx02477107.The total cost is 400$. (OEM Mercedes Pump cost 900$).
The pump is Hella made but the Filter no details what is it.
Thank you all.
Last edited by redaotrosh; Aug 24, 2025 at 05:24 AM.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by TimC300
My local MB dealer will install parts I supply, which I was actually surprised when I asked. I had them replace a passenger side exhaust manifold that I could not do myself and I already had all the parts.
I have found that the parts department and the service department are separate business units (profit centers). Service is based on selling services, not parts. So, the motivation is to provide the service and keep customers. There is always the caveat that any parts you supply will not be covered by the dealership if something fails, so their risk is mitigated. If you provide good parts at a discount and pay separately for services, it's a win-win for the customer and service department.
After driving the car for 450 KM, the issue come back for my car as the following:
Today morning, I have started the car and everything looks good, during this trip I got warning that Rear right tire low pressure so it is a punch. I took the car to Wheel service to fix it. After moving to continue my way, at first and second Traffic light stop, my car start to hesitate/vibrate on idle when RPM less than 700. Stop and start car, stop A/C the same issue(ECO start and Stop deactivated). Then continue my way to work during acceleration everythings looks fine but when reach office and stop the car at idle the vibration come back but not huge. No codes and no CEL. When coming back home the car is better and vibration at idle was minimal until I reach the parking, CEL flashing and car vibrate/hesitate to much until stop and turn off/on again everything gone.
I am thinking to take car tomorrow to Service center but not dealer. What do you suggest? If my issue not Fuel pump what it could be?
Last edited by redaotrosh; Aug 28, 2025 at 11:07 AM.
After driving the car for 450 KM, the issue come back for my car as the following:
Today morning, I have started the car and everything looks good, during this trip I got warning that Rear right tire low pressure so it is a punch. I took the car to Wheel service to fix it. After moving to continue my way, at first and second Traffic light stop, my car start to hesitate/vibrate on idle when RPM less than 700. Stop and start car, stop A/C the same issue(ECO start and Stop deactivated). Then continue my way to work during acceleration everythings looks fine but when reach office and stop the car at idle the vibration come back but not huge. No codes and no CEL. When coming back home the car is better and vibration at idle was minimal until I reach the parking, CEL flashing and car vibrate/hesitate to much until stop and turn off/on again everything gone.
I am thinking to take car tomorrow to Service center but not dealer. What do you suggest? If my issue not Fuel pump what it could be?
I had an episode last September with the 2015 ML 350 (M276 NA)
- Flashing CEL, rough idling, less power than usual when tried driving it.
- Flashing CEL went away after a restart. Not consistently
- Flashing CEL reappeared after a short drive. It went away after sitting all day.
- Flashing CEL disappeared for a few days, until it came back -> Finally, a code -> Coil 5
- Bought two coils, replaced coil 5, and nothing until now. (nearly a year). Spare coil in the trunk.
After driving the car for 450 KM, the issue come back for my car as the following:
Today morning, I have started the car and everything looks good, during this trip I got warning that Rear right tire low pressure so it is a punch. I took the car to Wheel service to fix it. After moving to continue my way, at first and second Traffic light stop, my car start to hesitate/vibrate on idle when RPM less than 700. Stop and start car, stop A/C the same issue(ECO start and Stop deactivated). Then continue my way to work during acceleration everythings looks fine but when reach office and stop the car at idle the vibration come back but not huge.
No codes and no CEL.
When coming back home the car is better and vibration at idle was minimal until I reach the parking, CEL flashing and car vibrate/hesitate to much until stop and turn off/on again everything gone.
I am thinking to take car tomorrow to Service center but not dealer.
What do you suggest?
If my issue not Fuel pump what it could be?
Hopefully your repair specialist will be able to diagnose your issue further.
You are experiencing misfires: either gas or spark??
Get a reliable ignition tune-up at once if due, check live fuel pumps pressures and idle fuel trims.
The car now under sepcialist diagnosis, so I kept for 1 hour with him, he check the codes that mention missfire over 1 cylinder, he checked the spark plug and use new coil but issue still exist, so he put back the parts and start testing the fuel pressure over the injector, so I left the car their and he will give the report after that.
I asked him what happen over the previous center, he said that the old pump is not the issue. I am trying to contact MB secondary service center if I can get the old part but they are not answering.
I got the car recently as the issue was triggred for injector of Cylinder 3, he replaced it with used one. I did testing trip for 100 KM, I noticed some little vibration then after a while CEL get steady ON, no flashing nor Odors smell neithar hard vibration. SO the symptoms be better than before. I went back to him for investigation, they check Vaccums for any leak and check again the injector. The same injector was faulty. he got clean one and replace again. Now I am testing the car for 2 days, until everything looks good but waitng the whole week to confirm.
Another point, I was hearing from long time noisy sound when RPM over 2000, so I replaced the middle idle pulley and the sound looks great.
I will keep you posted for updates.
Thanks all for your support.
I got the car recently as the issue was triggred for injector of Cylinder 3, he replaced it with used one. I did testing trip for 100 KM, I noticed some little vibration then after a while CEL get steady ON, no flashing nor Odors smell neithar hard vibration. SO the symptoms be better than before. I went back to him for investigation, they check Vaccums for any leak and check again the injector. The same injector was faulty. he got clean one and replace again. Now I am testing the car for 2 days, until everything looks good but waitng the whole week to confirm.
Another point, I was hearing from long time noisy sound when RPM over 2000, so I replaced the middle idle pulley and the sound looks great.
I will keep you posted for updates.
Thanks all for your support.
Hi again,
I am getting CEL after 30 to 40 minute driving in daily basis with error
Air Leak detected in the Intake Air System. If I connect the scanner to the car. CEL will truned off after that without clearing the code.
Yesterday during my trip after 40 min the CEL get on. After stopping the car for 20 minute then start back the CEL is off but after another trip CEL triggered but never get off even after connecting scanner without clearing codes.
Please check the latest report and what can I do troubleshoot this issue before go to garage.
Last edited by redaotrosh; Sep 8, 2025 at 06:39 AM.
Hi again,
I am getting CEL after 30 to 40 minute driving in daily basis with error
Air Leak detected in the Intake Air System. If I connect the scanner to the car. CEL will truned off after that without clearing the code.
Yesterday during my trip after 40 min the CEL get on. After stopping the car for 20 minute then start back the CEL is off but after another trip CEL triggered but never get off even after connecting scanner without clearing codes.
Please check the latest report and what can I do troubleshoot this issue before go to garage.
You started the post by indicating that the issues began after you replaced the spark plugs, correct? Did you remove the intake manifold to replace the spark plugs? If you did, either the intake manifold is not properly installed (likely the gaskets), or something is not correctly connected.
I will check/replace the gaskets and the O rings related for any hose/part in the intake air system. About upper O2 sensors, I will do it later this year unless the issue exist so will do it directly. Will keep you posted.
I took the car to the garage, he used smoke leak detector device by put it iñ the one of the Manifold hose, after couple of minutes, smoke start to leak from the pressure sensor(cracked from the back). He replace it and clear all dtc. I did several tests mixed with small and long trips. Everything looks fine and the full power with normal fuel consumption get back as before.
I will test more and more.
I'll keep you posted.
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