K michelle Posted February 20, 2024 Report Share Posted February 20, 2024 2018 Ford CMax hybrid … replaced all 4 ignition coils, spark plugs, all 4 engine igniters, air filter, pcv valve(pain in the ass.. its located behind the manifold), O rings… check engine light returns faithfully every 2 weeks following each replacement of parts.. HELP!!!! I am ready to get rid of this vehicle.. any suggestions???????????? Quote Link to comment Share on other sites More sharing options...
homestead Posted February 20, 2024 Report Share Posted February 20, 2024 Look for an experienced mechanic that will troubleshoot the problem rather than just swap components to see if that will fix the problem. What codes showed up from the check engine light? Quote Link to comment Share on other sites More sharing options...
C-MaxA2 Posted February 23, 2024 Report Share Posted February 23, 2024 I would buy and throw some 'Lucas Upper Cylinder Lubricant'. I've used it in my Fords (from the Focus ZTW to my Ford C-Maxs) to avoid check engine codes. Cheap and doesn't hurt anything so why not try? Quote Link to comment Share on other sites More sharing options...
nogoodbum Posted February 24, 2024 Report Share Posted February 24, 2024 Hello, welcome to the forum. After reading your post, i assume that your have read the codes & they are misfire related. You appear to have attacked the problem on the ignition & air as the source of the codes. [I am unsure what you call the engine igniters]. You may need to look at the fuel-related part of the equation. The C-Max seems to throw codes more quickly than most other cars I have owned, [may be my mis-info, no verified stats]. You may help the problem by using a good fuel injector cleaner for a couple of tanks of gas & on a recurring basis if this helps. Thanks for the read. Quote Link to comment Share on other sites More sharing options...
db22 Posted July 17, 2024 Report Share Posted July 17, 2024 My 2015 C-Max Energi engine warning light is on most of the time. The car runs well most of the time, the only problem being a weird ICE miss/stutter/shut down at highway speed when the cruise control is on. If I pull over, shut the vehicle down, wait 30 seconds and then restart, the problem is gone. Sometimes all I need to do is turn off the cruise control and move the accelerator up and down a few times to speed up/slow down the vehicle. Also, the brake warning light and "ding" come on for no apparent reason, usually when the car has been sitting out in the sun and is hot, most often when the ICE starts immediately upon pressing the "start" button. The brakes operate normally, and the regenerative braking system seems to be functioning as it should. Quote Link to comment Share on other sites More sharing options...
jinni Posted March 12 Report Share Posted March 12 i don't know what to do. service light went on in November, 2024. i had it serviced at Ford which has always been good at oil changes without a large bill, $60. A dozen things were replaced, things that apparently didn't need to be done according to 2 car friends. car is 7 yrs old but only 30,000 miles. was ok for a month then in december the wrench light went on for a day and took it for service. relaced 12 volt battery in back which was appartently overlooked the first time. then in january service light went on again but went off after 2 days. now in february service went off again but service dept could find nothing wrong. service light went off for a month. just now in march 2025 light came on again and wrench light too, but only for a day. i don't know what to do. my grandson is bringing his scanner tomorrow to see what he can determine. any and all ideas welcome from you all. thanks. Quote Link to comment Share on other sites More sharing options...
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