Engine light help
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Joined: Jul 2024
Posts: 143
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350 E
My Check Engine Light came on twice in the past three weeks. Stayed on for two days each. Gas Cap was tight so that was not the reason though it is most common. I made sure to fill up gas tank again in case some condensation at one of the Suncoco Gas Stations. Light has not been on in past two weeks. I always use premium gasoline. I have my auto going to dealership next week just to do diagnostic checkup. If Check Engine Light is Blinking, then you must ASAP get to dealer. Recent cold weather could have been a factor. Auto only has 3200 miles on it. Engine was running smoothly the whole time Check Engine Light was on.
Roadrunner
Roadrunner
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Member
Joined: May 2020
Posts: 180
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From: New York
2025 e450
My Check Engine Light came on twice in the past three weeks. Stayed on for two days each. Gas Cap was tight so that was not the reason though it is most common. I made sure to fill up gas tank again in case some condensation at one of the Suncoco Gas Stations. Light has not been on in past two weeks. I always use premium gasoline. I have my auto going to dealership next week just to do diagnostic checkup. If Check Engine Light is Blinking, then you must ASAP get to dealer. Recent cold weather could have been a factor. Auto only has 3200 miles on it. Engine was running smoothly the whole time Check Engine Light was on.
Roadrunner
Roadrunner
Thread Starter
Member
Joined: May 2020
Posts: 180
Likes: 17
From: New York
2025 e450
My Check Engine Light came on twice in the past three weeks. Stayed on for two days each. Gas Cap was tight so that was not the reason though it is most common. I made sure to fill up gas tank again in case some condensation at one of the Suncoco Gas Stations. Light has not been on in past two weeks. I always use premium gasoline. I have my auto going to dealership next week just to do diagnostic checkup. If Check Engine Light is Blinking, then you must ASAP get to dealer. Recent cold weather could have been a factor. Auto only has 3200 miles on it. Engine was running smoothly the whole time Check Engine Light was on.
Roadrunner
Roadrunner
Senior Member
Joined: Jul 2013
Posts: 308
Likes: 76
2024 E350
Your car should be under warranty so it's free to take it to a dealer. You can also take it to any Autozone or similar auto store and they will scan your car for error codes for FREE. A bad batch of fuel could also cause the check engine light to pop up, but there's so many possibilities that you'd need to have it scanned to know for sure.
Thread Starter
Member
Joined: May 2020
Posts: 180
Likes: 17
From: New York
2025 e450
Your car should be under warranty so it's free to take it to a dealer. You can also take it to any Autozone or similar auto store and they will scan your car for error codes for FREE. A bad batch of fuel could also cause the check engine light to pop up, but there's so many possibilities that you'd need to have it scanned to know for sure.
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Thread Starter
Member
Joined: May 2020
Posts: 180
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From: New York
2025 e450
My Check Engine Light came on twice in the past three weeks. Stayed on for two days each. Gas Cap was tight so that was not the reason though it is most common. I made sure to fill up gas tank again in case some condensation at one of the Suncoco Gas Stations. Light has not been on in past two weeks. I always use premium gasoline. I have my auto going to dealership next week just to do diagnostic checkup. If Check Engine Light is Blinking, then you must ASAP get to dealer. Recent cold weather could have been a factor. Auto only has 3200 miles on it. Engine was running smoothly the whole time Check Engine Light was on.
Roadrunner
Roadrunner
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From: Tennessee
W214 E450
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Thread Starter
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Joined: May 2020
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From: New York
2025 e450
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You're welcome : ) https://developer.mercedes-benz.com/...nostic_support
https://www.mercedes-benz.ca/en/mercedes-app
Remote Vehicle Diagnostics
Allow your preferred service dealer to remotely retrieve vehicle data ahead of service, so your experience is as smooth as possible.https://www.mercedes-benz.ca/en/mercedes-app
Thread Starter
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From: New York
2025 e450
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From: Tennessee
W214 E450
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MBWorld Fanatic!
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From: Tennessee
W214 E450
In my experience, these things just don't disappear. There may still be an underlying issue. If it were my car, I would still get it scanned to see what codes are stored. If there was a CE light, it should have thrown codes and they would still be there in memory even after the light goes out.
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In my experience, these things just don't disappear. There may still be an underlying issue. If it were my car, I would still get it scanned to see what codes are stored. If there was a CE light, it should have thrown codes and they would still be there in memory even after the light goes out.
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From: Tennessee
W214 E450
Well, now I have a CEL on. Started today just after I left my house. Will be asking MB to do a remote diag on the car. Car is running fine and everything is functioning as it should. No other warnings other than a TPMS from yesterday that I cleared. I just texted the dealership and they responded (after hours) that they will check in the morning.
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From: The Middle of the Fairway
2025 E450 All Terrain Wagon, Nautical Blue Metallic, Macchiato Beige/Black Interior
My CEL came on last week while on short trip home. I undid the gas cap and left it open for a few minutes. I had about ½ a tank of gas. After I closed the gas cap the CEL was gone next time I started the car and has not come on again. Since it was just a brief, single incident I did not have enough concern to reach out to the dealer but would have had it not cleared so quickly.
Last edited by beechcamp; Aug 21, 2025 at 07:25 AM.
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From: Tennessee
W214 E450
My dealership sent me this message this morning. I'm going to bring it in but looks like I need to wait until Labor Day for a loaner car to be available. Hopefully they can fix my USB music issue and I'll get the 333 update.
One of our head techs ran the remote diagnosis and it looks like there are some internal engine control unit software updates needed to resolve the check engine light. There should be no difference in driveability of the vehicle at this time and no safety risk to you, so I can schedule you a time with a loaner car to have us look at that if you'd like!
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From: Tennessee
W214 E450
Went for a drive and the CE light is out. I did re-seat my gas cap, but it was on tight to begin with. Going to bring the car in on September 1 still for the software updates and have them try and fix the USB music issue.
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Joined: Aug 2014
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From: Tennessee
W214 E450
The CEL came back on today. No messages in the service menu and car runs and drives fine. I kept my appointment for Labor Day so regardless of it going out again, it's going in.
