Code P0172 & P0175 on Mercedes W212 E-Class - MAF Sensor & Throttle cleaning
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- čas přidán 26. 04. 2019
- I got a check engine light with some rough engine idle on my Mercedes W212 (E300 2011) a few days after replacing an ignition coil:
• Mercedes W212 E Class ...
Checking with an OBDII scanner it shows codes P0172 & P0175 for engine rich condition on bank 1 & 2. Fuel trims on both banks showed below -20% (long term + short term). O2 sensor readings for both banks were similar to each other. Fuel pressure was stable with the ignition on and engine off. I decided to first clean the mass air flow sensor (MAF) and the throttle and see what happens (both were very dirty). Cleaned the MAF and throttle with electronics spray cleaner since I couldn't find MAF and throttle spray cleaner until a week later. After cleaning, the Fuel trims on both banks went down to -15% but the check engine was still on. After driving the car for a few days (engine was a lot smoother) the check engine light turned off on day 3.
**Update: The check engine light came back on 2 weeks after it was gone with the same codes. At this point I suspected the intake manifold or the MAF sensor. Since I didn't want to just throw expensive parts to fix the issue and couldn't check if any were the problem I decided to go to a Mercedes shop for diagnosis. Initially, they told me I had a bad intake manifold and wanted to also change the spark plugs and 2 coils. Since they seemed to know what they are doing I gave them the green light to fix it plus the labor was reasonable at the time. When I came to pick up the car it turned out that they also decided to change the MAF and removed the 2 new coils since they were not needed. The problem is fixed now but seems I was wrong for letting a shop blindly throw parts at my issue when I could have done the same myself.
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I am not a certified or professional mechanic. This video is for entertainment purposes only. Zaki Garage assumes no liability for any actions performed by the viewer as a result of the information contained in this video. - Auta a dopravní prostředky
Thankyou very much, i apreciate your help and honesty blesses for you and yours on this new year.🎉
Dziękuje za pomoc . Check engine w końcu zgasł . Pozdrawiam z Polski 🇵🇱
I did it just right after see this video, and, Magic... works... same codes, clean everything and fix it.... thanks. Tumbs up.
That's great to hear! Just keep driving it for a few days to make sure the cleaning works and the codes don't show up again.
I had P0172 and P0175 codes come up, (System Too Rich Bank 1 and Bank 2). The first sign of an issue was when I started the car, the engine would rev on it's own at idle until it warmed up. There was a slight hesitation in starting out in gear. Then the engine light came on while at a light. The issue I had was when I changed my engine air filters inside the top aft cover that I removed, and I reinstalled the cover, the air opening on the center aft section of the cover was not fully pressed down over the intake opening. Once I had pressed the cover fully down over the port, I felt it seat more. I cleared the codes and took the car for a ride. The engine light has stayed off and I can feel it running smoother.
Not bad, I might have done that same mistake of not seating the filter housing correctly years back when I first got the car but it never gave me an engine code. Unfortunately, I might be starting the same issue again the past weeks of rough engine idle but no codes yet. I think I overlooked the source of the issue and now its hitting again of crankcase breather valve leaking oil into the throttle and intake manifold. Might make a video of changing the crankcase breather valve this weekend.
I will let everyone on a little secret how to repair. The main problem is the MAF. If anyone uses Brakleen or Gumout, the unit will kick codes. The unit is contaminated. Remove the maf and assy. Submerge and clean it with Dawn dishwashing detergent and hot water. Rinse and use hair dryer to dry. Next, check and replace the air filters if necessary. If this does not work, remove and clean again. If it still does not work, replace with only a Bosch MAF. You are welcome :)
U a life saver
Great video, also not feeling so bad after seeing the Amount of grease n dirt
Great video thank you
Something that isn't being mentioned here is how important it is to keep your air filters clean! The MAF will not get dirty to this point if the Air Filter was changed regularly.
True changing air filters regularly helps but the MAF will fail eventually, I've seen a few fail with regular maintenance. This car was actually regularly taken to the dealership for all its maintenance up till the video.
@@ZakiGarage i gotcha. And you're right as well. Sometimes, these electronic parts do eventually fail.
My issue came from when I changed my air filters in that aft cover and NOT reseating it fully back on the engine. Air was not flowing right and I got the codes and engine light. Such a simple fix.
Good job 🎉
For a moment there (6:13), I thought you had three hands! Great video, including the difficult camera angles. Thanks.
Thanks, planning of filming it again while replacing the PCV valve hopefully more clearly soon
Followed your exact advice... Same day the codes disappeared! Highest of fives!
Glad it helped
Hi I have a same code and I search in google and CZcams if I doing some you is correct and what I search
In my experience I have observed that the oil separator is clogged, this generates a higher vacuum than normal. After 5 months of revision, what I found was to clean the oil separator. the right bank showed -6%, after cleaning it was reduced to -3.8%. Good luck and I hope you can solve your fault P0750 / p0746.
I speak Spanish, excuse the translation
True, have noticed the oil separator on these engines are really bad. They let lots of oil through them and into the intake manifold and cause lots of issues.
I liked it ¿Did you adjust something with the scanner after cleaning up the parts? I'll try to do it. Thank you
No, I didn't do anything. I left the codes on there and didn't delete them to see if the check engine disappears by itself if the issue was fixed. The whole story is in the description .
i just finished cleaning my MAF and throttle body and the 2 codes appeared the next day, they should go away on its own right?
Yeah they should go away if they were the issue, I would wait a few days driving the car. If the codes are still there something else is wrong.
I've done the same now it triggered a new code 😐
Hi - good video. Do you have the link of the Bluetooth scanner you used for your Mercedes ? Looking to buy one. Thanks
Thx, I use this scanner "Bafx Products Wireless Bluetooth Obd2 Scanner"
www.amazon.com/BAFX-Products-Wireless-Bluetooth-Diagnostic/dp/B005NLQAHS/ref=sr_1_11?crid=2N6IPT2WDJBLA&dchild=1&keywords=obd2+scanner&qid=1608786440&sprefix=obd%2Caps%2C312&sr=8-11
I have P0018 crankshaft position correlation,andP2015 intake manifold runner position.
Engine light come on but car running Good little bit slow when step on gas.
What parts I need to replace. Thanks
I actually have that same issue with another car right now. I wouldn't drive the car if were you and take it to shop to check it ASAP. You might need a timing service, ignoring the problem could cause you to get a new engine.
Did u simply pull the plug out or was there clips you had to press on to remove the electrical component
The MAF plug has a clip that has to be pressed, its a hard plug to get out since there isn't much space in there.
I like your Videos, all the videos are very good. I hope to see more Mercedes Video. Which OBD App do you use??
Thx, I have a few Mercedes videos planned but will take some time. I use the paid torque app.
thanks for the video! It helped me out, I believe the car is running better. Time to wait 3 days to know if it worked.
Did you have to do anything about P0746? I have the same code and was gonna replace the position and magnet for position a?
I ignored that code and it didn't come back again. But I did get the same issues again last year and replaced more of the vacuum hoses and opened the valved and cleaned inside the to resolve the fault codes.
Hi Zaki, please
I want you to tell me
Can i run this scanner on my iphone
Also, what are the numbers that can help me fix it
@@user-jw9vl7jw4q hello,
You can use that scanner on your phone but you'll need the correct dongle. This one in specific is blue driver ~ 100 dollars.
But you can get cheaper ones for about 20 dollars and use torque lite (free) or torque (5 dollars) and get very similar results for this check engine light.
Any basic code reader probably also has a live data section where you can see fuel trims and engine codes
I cleaned my the MAF sensor on my C300 (I've done it successfully before) and now I have a P0101, P0102 and P0110 code and the engine idles low even on cold start. I did accidentally initially start the car with the MAF unplugged but now even with it plugged in I still have the same issue.
I have started cars with the MAF disconnected. Just need to connect it back, clear fault codes and start the car. I noticed first start after reconnecting the MAF is rough but goes back to normal. But in general cleaning the MAF doesn't always fix a bad MAF, usually it has to be replaced once the MAF is bad.
Thanks. Will erase the codes with my scanner.
Добрый день и как помогло пропали ошибки
Will i have a bad MAF sensor without throwing a code on 2010 e350. I am having rough running for a while i feel like it has a bad maf sensor but its not throwing any code or engine light. What do i need to check?
I had bad MAFs do that on my w212 and e46, so it is a possibility. I've also had it be the sparkplugs at half their intended life span. These engines are also known for oil from the PCV going into the intake manifold and messing it up. My car is on its 3rd manifold and its why I got a catch can installed so I don't need a 4th. I've also used intake cleaner spray to clean some of the oil in the intake manifold, it helped a bit.
Where is your location
I have the same code P0175 I change O2 sensors,spark plugs, ignition coils, new Maf and doesn’t work at all.
U must buy oem maf sensor
Have you tried doing what I did...pressing the aft cover over the port on the aft center under the aft cover? Mine seated more down and now it works great.
@@zaneyone1 what do you mean aft
have exactly the same mistake, is now the MAF Sensor defective ?
The MAF Sensor is one of many suspects of the source of the issue. It seems the MAF was the issue with my car but it might not be with yours. Unfortunately, the only way I know of how to check if the MAF is bad is by replacing it.
Zaki Garage with me is exactly the same, if I delete the error message then it comes after approx. 1 week again and the clean unfortunately did not bring however after you changed the part the error message does not come or?
After the shop changed all the parts I didn't get the check engine light again.
Zaki Garage okay thank you
So you're not sure if the issue was the throttle body and the MAF. I'm looking at a car for a friend of mine with the same engine codes. Waiting on the MAF to be delivered now. Was only $80 at fcpeuro.com
I own a 2011 e350 4 matic I got the code P0172 had the maf sensor changed I do my own mechanic work and the engine light still says the system is too rich bank 1 I’m gonna clean those 2 parts tomorrow before work if not then maybe it is in the spark plugs an manifold
Heyyy I have the same problem did u ever fix urs
Yeah but sold that car awhile ago I got a Toyota Camry now
Turns out it was the catalytic converter that went bad
I just see alot of yanking and pulling. Not sure where,what,why it how. I thought thered be some talking going on.
he cleaned mass flow air sensore and throtle body
Don't bother cleaning it, just get a new one..
I do agree with you if you dont mind spending the money, a new MAF cost me 370$ so taking a chance on cleaning it for 5$ and see if it fixes it doesn't sound like a bad idea to me.
What a nightmare...they couldn't put this in a better place? Ugh. I'd better load up on ibuprofen for my back before I replace mine