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Discussion Starter · #1 ·
Hi,
I did go through all posts regarding this P2188 "System too rich at idle" but couldn't find if anyone has actually fixed the issue and had their check engine light not to come back again and again. I have been having this issue for 6 or more months and decided to finally take care of it. Before I go to a shop, I wanted to find out some more useful info since I don't want to go back to a repair shop every 2 weeks and parts to be replaced for no reason. Any help would be greatly appreciated.
I am scared to go to the Mercedes dealership (I am in NYC) since the bill from them would be very expensive. My 2015 Passion has only 30 000K.
 

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Judging from some other vehicles I have owned, this can be caused by a faulty MAF sensor or a vacuum leak, among other causes. From what I've read, the Smart use a MAP sensor instead of a MAF, but the function is much the same. It sounds to me like it's probably a bit early for that to fail, but 30,000 is a bit early to suspect anything failing. If you've had it serviced recently, check the airbox is seated and any vacuum hoses that might have been disturbed are properly connected. I've not owned my Smart long enough to do much to it, so I don't have any direct experience with it to share.

I personally would only take my car to a MB dealership as a last resort due to the distance, hassle, and expense. I do most of my own work, but anything I can't do I prefer to farm out to an independent auto shop. When I'm looking for a new mechanic, I tend to ask around among my friends for recommendations and work from there. If you don't have any car-oriented friends, perhaps check out the reviews on local garages. Don't be afraid to take it to a couple of shops to have it checked it out, most will check it out for free or a small fee and you aren't comitted to repairs.

Hopefully someone with some more direct experience with the Smart will come along with more useful info, but in general any capable mechanic with the tools and skills can do almost any service to them.
 

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Discussion Starter · #3 ·
Update. Step 1- oxygen sensor replaced. Genuine. $500 incl labor!!! Engine light came back on day 2.
Brought it back to the shop. Today they cleaned the throttle body and reset the computer. Hope it will work.
If it doesn't next step will be to go to the local Mercedes stealer.
 

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A fellow New Yorker, born and raised in Ozone Park myself.
We also own a 2015 Passion that we adopted from the Mercedes dealer in Manhattan. Although we perform our own maintenance on her, there are times when I trusted no one with our baby other than an authorized Mercedes dealer.
Do yourself a favor, if you can leave Manhattan and travel out to Roslyn LI, RallyE motors is where I bring her yearly for inspection and any issues we are not able to correct. They have always been fair as far as price is concerned and are the only dealer on Long Island besides South Hampton Mercedes that work on the Smart. You know as well as I there are typical prices, then there are Manhattan prices!
Andrew Katigbak Service Advisor 516-625-1000 1600 Northern Blvd , Roslyn NY 11576
Good luck and please keep us informed “We Care”
Paula
 

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Discussion Starter · #5 ·
Thank you, P and Ch. Roslyn this option does not work for me.
Update: Oxygen sensor replaced, throttle body cleaned (a new one costs $1200), muffler exh replaced ($340). All good so far. Parts were all purchased from a smart center (I think they were actually delivered from the Roslyn center). Thanks God, my shop charged me very little for labor since I've been with them for 10 yrs.
So, throttle body was very, very dirty. The mechanic says its because of a bad gasoline. I put only the highest BP gas, mostly the same gas station. Considering going to a different brand/ gas station.

So far I am very disappointed with the Smart and Daimler. (this is my work car and it is great for parking and beating manhattan traffic though) The car has only 30K m and is 5v yrs old. Eats up the most expensive gas and parts are 2 to 3 times more expensive. For sure when I get to the point of buying a high class car, Mercedes will be excluded from my choice options.
 

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Good morning,
It’s sad to read that your so disappointed and dissatisfied with your Smart especially since we both own the same year.
My first thoughts on this would have to relate to past history and whether proper maintenance was performed, or ever performed. You didn’t mention if you were the original owner, so I don’t want to insinuate. I can only compare the years of our cars 2015 and the consistent service our car has received over the years we have owned her.
One thing I can agree on and what you mentioned is to change your gas selection from BP gas.
In the past we have had issues using BP with the trucks for our business, similar to what you’re experiencing. We would purchase there because of convenience, but have moved on to Mobil and have had no issues so far. But in reality it only takes one bad tank of gas to cause major problems, so its quite possibly a crap shoot.
In either case, best of luck to you,
Paula
 

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Hi,
I did go through all posts regarding this P2188 "System too rich at idle" but couldn't find if anyone has actually fixed the issue and had their check engine light not to come back again and again. I have been having this issue for 6 or more months and decided to finally take care of it. Before I go to a shop, I wanted to find out some more useful info since I don't want to go back to a repair shop every 2 weeks and parts to be replaced for no reason. Any help would be greatly appreciated.
I am scared to go to the Mercedes dealership (I am in NYC) since the bill from them would be very expensive. My 2015 Passion has only 30 000K.
In October 2017, my 2008 SMART car started displaying intermittently, persistently DTC P2188 SYSTEM TOO RICH AT IDLE BANK 1., exactly 1 week ON, the next week OFF (cleared by itself). After changing spark plugs, oil filter, air filter, engine oil P2188 persistently continued to display exactly 1 week ON, the next week OFF. I took my SMART car to Yorks Motorwerke in Walnut Creek, California. A previous SMART mechanic at the now closed Walnut Creek SMART dealer. They claimed they did all kind of emissions testing with all results negative. Before I picked the car, they decided to replace the spark plugs, claiming that the gap was too wide and that was causing the P2188. This did not make any sense because a mechanical failure (wide gap) will not correct itself the next week. I was desperate; therefore, I was willing to believe the experts at a cost of $300. Precisely, a week later, P2188 turn ON again. I immediately called Yorks and they agree to diagnose the car again for FREE. Again, they claimed they did all kind of emissions testing with all results negative. This time they proposed a possible leaking Head Gasket, no guarantees, and estimated repair cost of $500. Again, this did not make any sense because a mechanical failure (leaking gasket) will not correct itself the next week. This time I declined the repairs. In December 2017, I thoroughly cleaned the Air Mass Flow Sensor and air passage, but P2188 continued intermittently, and persistently displaying, exactly 1 week ON, the next week OFF. After watching a YouTube and hoping it will extend the life of Transmission, In June 13, 2018 (158159 Miles), I decided to change my 2008 SMART original old Transmission Oil, with Lucas Synthetic 75W-90, 2.5 Quarts. I don't know why, but to my surprised, changing the Transmission Oil, immediately and permanently eliminated P2188. As of today, March 12, 2020, my 2008 SMART car is still P2188 FREE.

On November 2017, my other 2013 SMART car started displaying intermittently and randomly DTC P2188. Also, in September 6, 2018 (77013 Miles), I decided to change my 2013 SMART original old Transmission Oil, with Lucas Synthetic 75W-90, 2.5 Quarts. I don't know why, but to my surprised, changing the Transmission Oil, immediately and permanently eliminated P2188.

On February 10, 2019, my 2013 SMART started displaying intermittently and randomly P2188. I am getting ready to change its Transmission Oil again.

3/12/2020 UPDATE: A few months ago, my 2013 SMART car started displaying continuously DTC P2188. Recently, May 5, 2020 (101500 Miles), I changed the existing Lucas Transmission Oil, with new Lucas Synthetic 75W-90, 2.5 Quarts. I don't know why, but to my surprised, again changing the Transmission Oil, immediately and permanently eliminated P2188. As of today, May 12, 2020 (102000 Miles), my 2013 SMART car remains P2188 FREE. I am an experienced Electrical Engineer, Industrial Controls System Programmer, and DIY Mechanic. It does not make sense to me why this work, but it works.
 
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