Lincoln MKZ check engine light comes on

Filed Nov 5, 2026 · Engine · 49,266 miles · OH

The contact owns a 2017 Lincoln MKZ. The contact stated that while operating the vehicle, the check engine warning light remained illuminated. The vehicle was taken the local Automotive service center, and the ignition coils and spark plugs were replaced. Shortly after retrieving the vehicle, the check engine warning light illuminated, and the vehicle was taken to the local dealer who diagnosed that the engine had experience coolant intrusion, and the contact was informed that the engine long block needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 49,266.

Filed Oct 22, 2026 · Engine · WV

Around end of May or beginning of June 2026 a check engine light came on in our 2018 MKZ. The code showed cylinder 3 misfire. We called our local Ford dealership for diagnosis. We almost didn't get there as it started to overheat on the way. Once at Ford they diagnosed it with coolant intrusion in cylinder 3. They said this was a known issue and needed a new block. $11,500 for replacement. They said driving it could cause catastrophic problems to the vehicle and possibly the passengers in it. The vehicle had 65,873 miles on it at time and once home it has stayed in the garage since. They said warranty was over and to call Lincoln for assistance programs as it was a known safety defect. I did call and Lincoln denied any help with repairs.

Filed Oct 7, 2026 · Engine · TX

I noticed on mid Sept/2026 when I started my car the engine was idling rough for a few minutes, then went idling normal. Every morning after it repeated itself when first starting the car and my check engine light came on. I scheduled a a diagnostic with an Auto shop and it was diagnosed as Cylinder 2 misfire. Shop told me to check if coolant level is lower in the next morning, I checked it was low & had to add more coolant, also no coolant on the floor. Check Engine Light on almost every day, took it to another auto shop for 2nd opinion, had them do a coolant pressure test. The Coolant pressure test showed Cylinder 2 had coolant getting inside it. Shop found TSB 19-2208 pertaining to this issue. Repair for this was to replace engine. Found out about Miller vs Ford Class action suit online which stated Ford had a Engine Block design flaw on the 1.0 L, 1.6 L, & 2.0 L EcoBoost engines which allows coolant to leak directly into the combustion Cylinders, which could cause severe overheating. My Lincoln MKZ has the 2.0 L EcoBoost engine. Eventually my engine will fail completely if I continue to drive the car. My MKZ engine was built on 08/2018

Filed Oct 2, 2026 · Engine · 86,000 miles · IL

The contact owns a 2017 Lincoln MKZ. The contact stated that while the vehicle was idling or driving there was a misfire. Additionally, while driving 30 MPH, the vehicle made an abnormally loud whining sound. The contact slowed down to 5 MPH and continued driving. The check engine warning light illuminated, and there was an abnormal burning odor coming from the vehicle. The vehicle was taken to the dealer and was diagnosed with coolant intrusion in cylinder #3. The dealer determined that the engine needed to be replaced. The manufacturer was notified of the failure by phone. The contact was referred to the federal safety agency Hotline to report the failure. The failure mileage was approximately 86,000.

Filed Sep 25, 2026 · Engine · MA

Head gasket and long block. I was at risk along with the public. I was driving on [XXX] when the car suddenly started to overheat and would not accelerate anymore. The problem was diagnosed today the coolant is leaking into cylinder 3. The check engine light came on and gave me p303 for a code. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 22, 2026 · Engine · 75,300 miles · MI

The contact owns a 2017 Lincoln MKZ. The contact stated that upon starting the vehicle, the check engine warning light remained illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed, and the contact was informed that the engine was faulty due to coolant intrusion and that the engine needed to be replaced. The manufacturer was notified of the failure. The failure mileage was 75,300.

Filed Sep 4, 2026 · Engine · TX

I purchased a 2017 Lincoln MKZ and began experiencing serious engine problems, including repeated overheating and an engine misfire. The vehicle developed a check-engine light and a P0301 misfire code. I was advised by a repair shop that the vehicle has a serious engine problem and that the engine needs to be replaced. I am concerned that the overheating and engine problems could cause the vehicle to suddenly lose power or suffer complete engine failure while I am driving. If the engine loses power unexpectedly while I am traveling in traffic, I could be unable to accelerate or safely move out of the way of other vehicles, creating a serious safety hazard for me, my passengers, and other motorists. I contacted Lincoln regarding these problems and asked the manufacturer for assistance, but Lincoln refused to provide assistance with the issue. I am now left responsible for addressing a potentially serious engine and safety problem. I am requesting that the federal safety agency document and investigate these engine, misfire, and overheating problems to determine whether they may be related to a safety defect affecting other 2017 Lincoln MKZ vehicles.

Filed Aug 22, 2026 · Engine · FL

We are submitting this vehicle safety complaint regarding a dealer-confirmed coolant-intrusion failure in our 2017 Lincoln MKZ equipped with the 2.0L EcoBoost engine. The vehicle had approximately 60,063 miles when presented to Parks Lincoln of Longwood. The vehicle developed a check engine light, rough running, shaking, and recurring misfire symptoms. Two ignition coils had recently been replaced, but the symptoms returned. The vehicle also produced white exhaust smoke on startup after sitting for several days. Because the rough running was so severe, the vehicle was ultimately towed to the Lincoln dealership on a flatbed. Parks Lincoln's Repair Order 2684839/1 documents DTC P0301. The technician states that, pursuant to TSB 22-2229, a coolant pressure test and cylinder inspection were performed; coolant intrusion was found in cylinder 1; and a long-block engine is required to properly repair the concern. Lincoln TSB 22-2229, the federal safety agency Manufacturer Communication No. 10214126, describes coolant intrusion in certain 2.0L EcoBoost vehicles including 2017-2019 Lincoln MKZ models. The bulletin identifies white exhaust smoke, rough running, and misfire codes, including P0301, and directs replacement of the long-block engine assembly when the condition is confirmed. Our safety concern is that coolant intrusion can progress from rough running and misfire to loss of engine performance or engine failure while the vehicle is in operation. In our case, the symptoms became severe enough that we did not consider continued driving appropriate and had the vehicle transported to the dealer. We ask the federal safety agency to add this complaint to its defect database and evaluate it together with other reports involving 2.0L EcoBoost coolant intrusion, misfire, loss of power and engine failure. We can provide the complete dealer repair order, estimate and additional records upon request.

Filed Jul 6, 2026 · Engine · FL

The engine light came on. The car suddenly wouldn’t go past 35 mph . Thankfully I was on a local road. I had it towed to the dealer and was told that the engine needed to be replaced because coolant leaked into the engine. There were no warning lights except the day of . The car did not give any indication of a leak. Nor was it running hot. Everything was functioning fine.

Filed Jun 24, 2026 · Engine · FL

My 2018 Lincoln MKZ began misfiring on startups. Eventually the check engine light came on with a code of P0302. About a week later while driving, the engine temp gauge reached the hottest temp reading on the gauge. I had to immediately pull over. Upon pulling over I immediately checked the coolant level in the overflow reservoir and it was empty. After refilling with coolant I was able to drive the car home. Over the next few days I monitored the coolant level but at the same time the car was experiencing rough startups and smoke coming out of the exhaust upon startup. Sometimes turning the engine off and restarting it would stop the smoke, but sometimes it wouldn't. I began doing some research and discovered, Technical Service Bulletin (TSB) 19-2346, which explains my exact experience with my 2018 Lincoln MKZ. I have yet to take my car to the dealership for repairs due to the costs that are expected to have this issue resolved. Documents in the legal case, Miller, et al. v. Ford Motor Company (Case No. 2:20-cv-01796) claim that Ford was aware of this defect in their vehicles dating back to 2010. I purchased my 2018 Lincoln MKZ back in 2019.