# The Check Engine Light is On, What Should I Do? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercedes-benz, transmissions, engines\ **Created:** [May 29, 2025, 10:00pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472 "2025-05-29T22:00:26Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![liusijia\_193769](https://avatars.discourse-cdn.com/v4/letter/l/87869e/32.png) [@liusijia\_193769](https://community.cartalk.com/u/liusijia_193769)\ **Post date:** [May 29, 2025, 10:00pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/1 "2025-05-29T22:00:26Z")
Hi everyone, I drive a 2022 Mercedes-Benz CLS-Class, and today the **check engine light** came on while driving under normal conditions in the city. The car still drives smoothly — no rough idling, no loss of power, no unusual sounds — but the light remains on even after restarting the engine. I haven’t noticed any performance issues, but I’m a bit concerned. Has anyone experienced this on the CLS before? I haven’t used an OBD2 scanner yet — do you think it’s worth getting one to check the code myself before going to the dealer? Or would you recommend going straight to a Mercedes service center? Could it be something simple like a loose gas cap or a minor sensor fault? Or is it likely related to something more serious like the emissions system? The Mercedes me app just says: “Engine control system malfunction – visit workshop,” but it doesn’t provide any specific details. Any advice or shared experience would be greatly appreciated! Thanks in advance! ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 29, 2025, 10:02pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/2 "2025-05-29T22:02:34Z")
Check local parts stores. Some will connect a code reader to the vehicle and get the stored codes for free. Tester ---
**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\ **Post date:** [May 29, 2025, 10:29pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/3 "2025-05-29T22:29:45Z")
That message could mean lots of things but the wording is a bit scary. If the light isn’t flashing you are OK for a while. If you get a code reader, remember to check for additional codes because they won’t all show at once. Learn how to go to the next one. ---
**Author:** ![ledhed75](https://avatars.discourse-cdn.com/v4/letter/l/f6c823/32.png) [@ledhed75](https://community.cartalk.com/u/ledhed75)\ **Post date:** [May 29, 2025, 10:49pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/4 "2025-05-29T22:49:51Z")
Is the car still under warranty? If so, take it to the nearest dealer. If out of warranty… you can certainly figure out how to get the error code yourself…but I bet you’re going to still have to take it to a mechanic. Personally I’d just take it to the mechanic as soon as possible. Seems easier. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [May 29, 2025, 11:22pm UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/5 "2025-05-29T23:22:30Z")
> [@liusijia\_193769](#): > > Could it be something simple like a loose gas cap Could be, I’d take it off, check that the gasket is clean, and put it back on. I’d also get the codes read at a parts store. Let us know what they find. ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [May 30, 2025, 12:49am UTC](https://community.cartalk.com/t/the-check-engine-light-is-on-what-should-i-do/200472/6 "2025-05-30T00:49:29Z")
> [@liusijia\_193769](#): > > Could it be something simple like a loose gas cap or a minor sensor fault? Yes, but it could also be something worse. Checking the codes with a scanner will point you in the right direction, unless you have a crystal ball that works… lol If under warranty, just take it to the dealer… Welcome to the forum… lots of good advise in the above post…