CLS Coupe (C257) Discuss the CLS Coupe

Check Engine Light!!!!!!

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Old Sep 10, 2019 | 08:56 PM
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Check Engine Light!!!!!! CLS 53 AMG


Check Engine Light just arrived. Unreal. 600 miles.

If anyone has information about this please advise.

Last edited by Rick2019; Sep 12, 2019 at 07:49 PM. Reason: Model type
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Old Sep 10, 2019 | 09:53 PM
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Probably just an o2 sensor, it's under warranty right?
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Old Sep 10, 2019 | 10:36 PM
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Yes it is.
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Old Sep 11, 2019 | 02:24 AM
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happen to my 10 months old 5000Km CLS 450 twice in 6 months,it's the coolant temperature sensor ,dealer just took out clean it and resecure will do, i am from singapore maybe because of the hot weather.so far no solution to what i know of.
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Old Sep 11, 2019 | 12:26 PM
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Wow. Ok. That's valuable information. Thank You.

I heard it could be my gas filler cap possibly being loose.

This car has so many electronics in it you just never know.
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Old Sep 11, 2019 | 04:11 PM
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Originally Posted by Rick2019
Wow. Ok. That's valuable information. Thank You.

I heard it could be my gas filler cap possibly being loose.

This car has so many electronics in it you just never know.
I recall reading that the 2014 S class has over 100 sensors.....and that was 4 years ago! Imagine how many they have now!
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Old Sep 12, 2019 | 12:34 AM
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i got another sensor problem is the left most sensor in front of the car, keep beeping for nothing,no where near any obstacles but keep beeping,
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Old Sep 12, 2019 | 12:45 AM
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btw this is my ride
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Old Sep 12, 2019 | 07:44 PM
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OK back to the check engine light thread. I spoke to my service advisor this afternoon. The foreman in the service department he’s trying to figure out what is going on with the vehicle. He contacted Mercedes and Mercedes is sending a rep down tomorrow to the dealership service department. They did find a store code saying that there is an issue with the electrical wiring for the turbo charger compressor. The Mercedes representative gave them a heads up and said that both front seats and carpeting may have to be pulled up to look at the wiring under the floorboard. Oh my God. I said nothing gets authorized until you speak to me.
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Old Sep 13, 2019 | 08:52 PM
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Rick,

Sounds crazy, I know you will keep us updated.
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Old Oct 3, 2019 | 02:16 PM
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Sorry for the delayed response.

Since leaving the dealer 2 weeks ago, the check engine light hasn't returned.




Originally Posted by ncdoc
Rick,

Sounds crazy, I know you will keep us updated.
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Old Oct 10, 2019 | 09:09 AM
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What did they end up doing to fix it?
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Old Oct 10, 2019 | 10:57 AM
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engine light

They ran diagnostic tests. No stored error code indicated a check engine light was illuminated.

They released the car to me. They said bring it back for further testing.

What would you do?


Originally Posted by Reefer36
What did they end up doing to fix it?
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Old Oct 10, 2019 | 12:04 PM
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I'd relax and drive my car.
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Old Oct 10, 2019 | 04:24 PM
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Agreed.

I don't like to bring my car to the dealer. I don't like lot boys driving my car, parking it wherever, overtesting it, getting in and out of it.

If it's an emergency or routine maintenance I'm bringing it.

These dealers today are such high volume that your beautiful car is just a number.





Originally Posted by hyperion667
I'd relax and drive my car.
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Old May 18, 2020 | 10:04 PM
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Mr. Yellow CEL is back as of yesterday afternoon.

Service advisor said bring it in so the tech can at least pull a fault code from it. I agreed. Stay tuned.



Originally Posted by Rick2019
Agreed.

I don't like to bring my car to the dealer. I don't like lot boys driving my car, parking it wherever, overtesting it, getting in and out of it.

If it's an emergency or routine maintenance I'm bringing it.

These dealers today are such high volume that your beautiful car is just a number.
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Old May 19, 2020 | 04:49 AM
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Originally Posted by Rick2019
Mr. Yellow CEL is back as of yesterday afternoon.

Service advisor said bring it in so the tech can at least pull a fault code from it. I agreed. Stay tuned.
Not to derail your thread, but a comment on bringing the car into the dealer...

Had my first yearly service performed a week ago. I think I was the only one at the dealership, and the service (basically an oil change) took 4 hours. Driving the car the next day I got a service message telling me my oil was overfilled! Never had that one before. I like my dealer (so far) but I can empathize with your feelings about keeping it away from there!
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Old May 20, 2020 | 09:27 AM
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Originally Posted by Rick2019
Yes it is.
How could it be out of warranty. This is a 2019 -- right? Are you sure the gas cap was tight?
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Old May 23, 2020 | 07:51 PM
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Out of warranty? No. Three more years of warranty.




Originally Posted by slk55er
How could it be out of warranty. This is a 2019 -- right? Are you sure the gas cap was tight?
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Old May 23, 2020 | 07:56 PM
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Originally Posted by Rick2019
Mr. Yellow CEL is back as of yesterday afternoon.

Service advisor said bring it in so the tech can at least pull a fault code from it. I agreed. Stay tuned.
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Old Aug 10, 2020 | 10:38 AM
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9500km ... CEL hit, car started to run on definitely lower amount of cylinders. Lucky for me it happened 8km from my Mercedes dealer so with 40-50km/h (impossible to hit more) I drove to them...

One ignition coil went to other world. Well in my previous F10 BMW 535xd 2015-2019 I was replacing 3xO2 sensor, so **** happens...
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Old Aug 14, 2022 | 02:55 PM
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Check engine light back on after two years of not having it on

Here we go again…….




[/QUOTE]


Last edited by Rick2019; Aug 23, 2022 at 11:20 AM.
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Old Jan 19, 2023 | 08:49 PM
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My light just came on as well. But the car drove fine. 23k miles on mine. Dealer can’t get it in until Monday. Hopefully it’s just something simple. Seems like with these cars it’s always a software update. My driver seat stopped working and nobody could fix it…butttt a software update did the trick lol. Has your car been fine since you brought it back for another software update?
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