Please help new to Merc! Check Engine off but theres some fault codes




i cant really make out the fuse on the bottom left corner, thats fuse # 3- Door Control Unit, should be 30 amp.
i got the info from here: https://fuse-box.info/mercedes-benz/...uses-and-relay
#29 (bottom right) should be replaced immediately!
i cant really make out the fuse on the bottom left corner, thats fuse # 3- Door Control Unit, should be 30 amp.
i got the info from here: https://fuse-box.info/mercedes-benz/...uses-and-relay
It's just a little bit confusing as it mentioning about the 'Catalytic Converter (Cylinder Bank 2) Is Not sufficient and when I clicked the (?) to know more about the fault code it shows different meaning like Fuel pump. I'll share the screenshots.
2 Fault code 0946 & 0942
0942 asking to inspect the wiring harness and connectors related to airbag control module.
0946 - Mentioning about the fuel pressure sensor
Do you think fuses also need to be check as well?
As you can see, whatever you are using is all over the place and unreliable.
Further, XENTRY can run you through tests to make sure the problem is not with your O2 sensors.
As you can see, whatever you are using is all over the place and unreliable.
yea agree with you, this might not be working properly on Mercs. I used it for my Honda maybe it just for jap cars. Ill check this xentry and it much reliable on Mercs. Thanks a lot @JettaRed
BTW its ThinkDiag dongle.
Tom will check and plug some fuses. I just got my order today.. There is some issue with the aux fan but let’s see if can resolve on the relay/fuses. Have a Great weekend everyone!
The Best of Mercedes & AMG
i cant really make out the fuse on the bottom left corner, thats fuse # 3- Door Control Unit, should be 30 amp.
i got the info from here: https://fuse-box.info/mercedes-benz/...uses-and-relay
@TimC300 @JettaRed Hello guys!
Quick update I have changed all neccessary fuses last week, including the 20amp (Starter) which was 30 last time and some other fuses that is on different brand I think. I was expecting the SRS (Right side) light will ressolve on its own. Lol but still the lights still on so maybe need to check the wiring or else will just clear it in OBD.
I have one more query Ill try to upload a short clip of it. The aux fan is a bit static even the engine is off, Static in a sense that it will spin time to time just 1 spin like every couple of mins I was thinking if it is the relay as I hear some click noise when I was changing the fuses. I just cant Identify correctly.




I dont remember you mentioning the srs light was on. May need a Mercedes specific scanner to see the fault if there is one. I have also seen other people have the srs light on because they played with the air bags or even seat belts whikle the battery was still connected. I think they ended up having to go to MB to have the code erased, not 100% sure.
I dont remember you mentioning the srs light was on. May need a Mercedes specific scanner to see the fault if there is one. I have also seen other people have the srs light on because they played with the air bags or even seat belts whikle the battery was still connected. I think they ended up having to go to MB to have the code erased, not 100% sure.
@TimC300 @JettaRed
Here's a short clip I took before after I got the registration for the car I just notice it.
If video doesn't play please click here >> https://vioo.cc/v/4Y4g tried to upload it online so I can share URL.
Thanks guys!




After you park and lock the car things will start to shut down, i think after like 6hrs it cuts power to alot of things to save battery. When you unlock the car it starts waking up again.
If you have that black plastic box above the battery removed you will see that door in there opening and closing on its own also.
Unfortunately I need to change my power steering pump, I bought it already together with the Reservoir.
Now I got confuse with the Power Steering Fluid. Which of these two?
I got both.
Fuchs Titan CHF 11S Power Steering Fluid
Febi Bilstein Power Steering Fluid Recommended Application for MB 236.3 / Dexron II?
According to ChatGPTFor your M272 engine (2012 C300 W204) with MB spec 236.3 power steering fluid, here are the correct ones:
✅ Febi Bilstein
- Part Number: 06161
- Spec: MB 236.3 / Dexron II-D
Advance Thank you for the help!!!




Heres the Mercedes BEVO link: https://operatingfluids.mercedes-benz.com/
For power steering you want the Pentosin CHF 11S. Its what I used to replace the power steering fluid in my 2010 W204 4matic sport. I happen to find it on sale for $10 but its gone up in price.
Last edited by TimC300; Aug 9, 2025 at 03:40 PM.
Heres the Mercedes BEVO link: https://operatingfluids.mercedes-benz.com/
For power steering you want the Pentosin CHF 11S. Its what I used to replace the power steering fluid in my 2010 W204 4matic sport. I happen to find it on sale for $10 but its gone up in price.
Thank you so much for this TIM!!
By the way the reason why Im confuse is I dont know if Steering rack or Steering gearbox, I just had a comment about using CHF 11S over MB 236.3. Now its more clarified to me.
Please see photo attached about my Steering rack and oil purchased. BTW Im living in middle east so the weather here is crazy hot even at night. Does it matter also in fuilds?




Use the MB 345 spec. Its what I used, its what I see everyone else using.
I'll post what I found below. But again ignore it in my opinion. I just wanted to see where that chatGPT may have come up with that spec.




By the way the reason why Im confuse is I dont know if Steering rack or Steering gearbox, I just had a comment about using CHF 11S over MB 236.3. Now its more clarified to me.
Please see photo attached about my Steering rack and oil purchased. BTW Im living in middle east so the weather here is crazy hot even at night. Does it matter also in fuilds?
I looked up your vin. You have the same 204.081 as me. The CHF 11S is the correct power steering fluid.
Now much clearer to me.
Ill give some short history, I was in a car garage last week for a change oil, then I mentioned to them that I'm having a weird noise coming form the Power Steering Reservoir tank and to my surprise mechanic told me that Im having issue on the Power Steering Pump which I really doubted, then I just suggest that we do the power steering fluid flush and put brand new fluids and I remember this FEBI brand thing that they put and I asked them if that is based on the specs, they answered yes. Then after all have done while driving home, I just notice the weird noise is getting stronger and while turning the steering wheel, now I called them and told me to be back at the shop to check, I even asked if they have bleed it properly. When I got there they insist to change the pump so I told okay Ill get the parts and drove away to check some parts and pick my family, then thats where the power steering is gone and oil have been spilled all over the parking.
Now I scheduled for changing the Pump. I bought
Bosch Power Steering Pump
Mercedes Reservoir Tank
O-ring
and some cripping lock for the hoses just incase.
and the fluid CHF 11s and the Febi as Im not really sure of.
I just hope tom everything will be fine. Finger crossed!




Found some more info on the power steering fluid.
Got my Power steering done and put the proper fluid its all good now! Thanks to you.
Noise has been eliminated never heard this silent before Lol. Maybe because I did some belt change and Tensioner as well, Pulley of my previous Power steering Pump has some grinding noise a bit plus the gargling/boiling noise on reservoir tank of Power steering, now its all gone!
Thanks man! Have a great day ahead!






