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Some good news. . . as I prowled around a couple of the discussions on the P2188 error, someone mentioned they turned their key to ON but did not start the engine and then hit the scan codes/clear codes on the ScanGauge. That worked for me. Cleared the code again. It might have been a phantom. When I looked back at the dealer invoices I saw they had said they told me the code could come back. They did, but they also said there were other things they might have to do if it did. I wonder of one of those was to turn the key to ON and clear the code.
 

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P2188 Code & $1,750 to repair!! Am I being taken to dry cleaning?

Hello everyone,

We have our 2008 Smart Fortwo Passion @ 88K. The engine light come on and the code was P2188. We took it to the dealership. Here listed below from the dealership:

Dealership: We have diagnosed the issue-The fault that is present now is a RICH fuel trim fault rather than the LEAN fuel trim fault that was present before. There is a ventilation system for the engine that allows oily vapors to be recycled & burned by the engine-sometimes this system can fail & allow too much oily vapor through to an area it shouldn't, causing damage to sensors. There is a sensor called a Manifold Absolute Pressure sensor (MAP) that has failed from excess exposure to oil-we need to lower the rear subframe of your Smart to access the sensor & ventilation system to replace all of it. The total cost for diagnosis, parts/labor & tax is $1750.00. We don't have all the parts in stock now & can order them to hopefully have them all here in the next day or two.

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Dealership: If you don't perform the work, the failing sensor will keep telling the engine control unit to use more fuel which will lower your fuel economy & may end up causing driveability issues in the future. Too much fuel delivered by the fuel injectors can saturate the spark plugs with fuel causing misfires, too little fuel can cause higher engine temperature causing engine damage.

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Now, my question to you all. Does that sound reasonable to repair it for $1,750? :shrug: We are tight with our $$. Is that something we can ignore for many more miles later? Are they trying to take us to dry cleaning? Any recommendation of repair shop in Indianapolis that can do this type of service at lower price? Or should we dump this car and get a newer used Smart Fortwo?




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I hit 52K on the way home today and also had my first CEL on the car right before I pulled into the garage. I pulled out the trusty SGII and pulled up a P2188 (too rich at idle), but the car was running fine. A little checking around on the Internet seems to indicate a few possible problem areas (O2 sensor, purge valve, etc.).

I just cleared the code after giving the engine bay a quick once over and we'll see if it returns. It's probably nothing, but in case it comes back, has anyone else run into this code on a smart and, if so, what was done to resolve it?

Edit: Nothing has changed (no mods) on the car over the past 10K miles or so. The oil and filter was changed about 2K miles ago and the air filter was cleaned about 8K miles ago. Iridium plugs have 20K miles on them.
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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