Got the Dreaded CEL P0171
Thread Starter
Member
Joined: May 2008
Posts: 139
Likes: 1
From: West Loop, Chicago, IL
Obsidian Black 2009 C63 w/ P30 Package
Got the Dreaded CEL P0171
Just came home from some spirited driving and noticed that my CEL ( Check Engine Light) was on. I have no idea when it came on but pretty sure it was a few miles right after I purchased gas.
I have a OBD II reader and the code is P0171. I researched it and I believe some people here were saying its a bad tank of gas? And a bunch of other various things. But Im sticking to bad gas since I literally just bought it and not long after I have the CEL.
My question is if it is how do I get the gas out ? I only bought 3.159 gallons of it.
I have a third party warranty ( AAGI) hopefully they will cover this.
thanks
I have a OBD II reader and the code is P0171. I researched it and I believe some people here were saying its a bad tank of gas? And a bunch of other various things. But Im sticking to bad gas since I literally just bought it and not long after I have the CEL.
My question is if it is how do I get the gas out ? I only bought 3.159 gallons of it.
I have a third party warranty ( AAGI) hopefully they will cover this.
thanks
Thread Starter
Member
Joined: May 2008
Posts: 139
Likes: 1
From: West Loop, Chicago, IL
Obsidian Black 2009 C63 w/ P30 Package
I deleted the code with my Actron OBD II reader and drove about 8 miles with nothing yet...question If I clear the code and nothing comes up again am I in the clear? Or is clearing it and doing nothing ( I havent purchased any gas today but I was told by the computer im on reserver gas) hiding the issue with my car
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
If there is still an issue the code will come back. The code will likely still be held in history if you wish to review past codes unless you clear the history as well. If the car is not showing any obvious signs of malfunction you should be fine to clear a code and see if it returns or if it was just a momentary issue.
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Thread Starter
Member
Joined: May 2008
Posts: 139
Likes: 1
From: West Loop, Chicago, IL
Obsidian Black 2009 C63 w/ P30 Package
i think you guys are right...The code came back today and its the same exact one.
P0171
I read somewhere that it could possibly be a purge valve as well. Going to call my third party warranty ( AAGI) and see how they work
Does anyone have them as well? I dont recall the details of my 3rd party warranty but I believe if its a 3K fix job my deductible is 100 $. But what if this is a small problem is it free?
I just tried calling and they are closed so will probably call tomorrow to find out more info about it
P0171
I read somewhere that it could possibly be a purge valve as well. Going to call my third party warranty ( AAGI) and see how they work
Does anyone have them as well? I dont recall the details of my 3rd party warranty but I believe if its a 3K fix job my deductible is 100 $. But what if this is a small problem is it free?
I just tried calling and they are closed so will probably call tomorrow to find out more info about it
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Thread Starter
Member
Joined: May 2008
Posts: 139
Likes: 1
From: West Loop, Chicago, IL
Obsidian Black 2009 C63 w/ P30 Package
I hope thats it... I believe CoolBeans has the same exact issue with the P0171 code and after reading his thread I hope I dont have to endure that.
On a 2nd note, I just contacted my third party warranty ( AAGI) and they said my warranty was voided?
After back and fourth calls with them and the dealership I got my car (Non MB)
Im bringing my car back to dealership I got it from and having one of their "journey" techs take a look at it while they resubmittted my contract for the extended warranty after a few months I have purchased it.
I dont know how I feel about dropping it off at non MB dealership and having them work on it.
Supposely they work on BMW, Audi and MB besides working on Toyota, Cadillac, and vary of American cars
On a 2nd note, I just contacted my third party warranty ( AAGI) and they said my warranty was voided?
After back and fourth calls with them and the dealership I got my car (Non MB)
Im bringing my car back to dealership I got it from and having one of their "journey" techs take a look at it while they resubmittted my contract for the extended warranty after a few months I have purchased it.
I dont know how I feel about dropping it off at non MB dealership and having them work on it.
Supposely they work on BMW, Audi and MB besides working on Toyota, Cadillac, and vary of American cars
Thread Starter
Member
Joined: May 2008
Posts: 139
Likes: 1
From: West Loop, Chicago, IL
Obsidian Black 2009 C63 w/ P30 Package
UPDATE:
I finally took my car in and it took them a week and they changed out the Intake Manifold Gaskets as someone mentioned.
Only time will tell if this resolves it.
I finally took my car in and it took them a week and they changed out the Intake Manifold Gaskets as someone mentioned.
Only time will tell if this resolves it.
Super Member
Joined: Aug 2011
Posts: 688
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2013 C63 Coupe
I had a P0171 on my wife's C230k...turned out to be a vacuum leak. My code reader can run active graph and ran it to look at the MAF... like the previous post, at idle the car would run ~45 bar (when normal) and when it would idle higher the MAP would drop to ~35 bar. Mine happened to be a vacuum leak associated to an o-ring missing at the master cyl to brake booster... the master cyl was changed by an independent shop the day before, so I was focusing on the work they proformed. Mind you I was getting a CEL too, but the independent shop said the work they did to replace the master cyl was not associated to the CEL... but there were a definite "hissing" sound.
In anycase, any vacuum leak can affect the CEL, so this is not to say this is your problem. I happen to take the car to MB dealer and confirmed my suspicion. They took photos of the missing o-ring.
In anycase, any vacuum leak can affect the CEL, so this is not to say this is your problem. I happen to take the car to MB dealer and confirmed my suspicion. They took photos of the missing o-ring.
