Engine And Engine Cooling Problems of Ford Mustang - part 1

The component that failed on my ecoboost Mustang 2019 was a failed design in the motor called the head gasket. The head gaskets broke and started leaking coolant into the engine. The engine has 39,000 miles.

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Random/multiple misfires and cyl 3 misfire (p0300 and p0303). Mechanic used a borescope and found coolant on the walls; visible coolant intrusion in cylinder 3. Coolant has gotten to low levels. Very rough cold start. Mechanic highly recommends to get the engine replaced.

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My cars head gasket blew at only 45,000 miles. Replaced my a local well known mechanic for around $3500. 00. Now my car at 96,000 miles has blown the head gasket again. I believe the car needs a whole new block. I have seen several lawsuits regarding this and just would love my car running again. This is not cheap to fix for me.

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The head gasket in my 2016 Mustang eco boost failed. I have 126k miles and coolant is leaking into cylinder 2. I’ve always taken care of the maintenance on a timely matter and no modifications have been done.

While driving approximately 45 mph and entering a highway, my 2022 Ford Mustang gt California special suddenly lost power and shut off completely. The engine stalled without warning, creating a dangerous situation with surrounding traffic. I had to coast the vehicle and restart it. This vehicle has an open safety recall (NHTSA recall number 25v455 / Ford recall 25s75) related to a low-pressure fuel pump failure that can cause engine stalling while driving. The recall has been open for several months, and there is currently no available remedy or repair from the manufacturer. The incident I experienced matches the recall description exactly. Despite the known safety risk, the manufacturer has not provided a fix, leaving the vehicle unsafe to operate. I am concerned for my safety and the safety of others due to the risk of repeated engine stalling at highway speeds.

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“charge system service now” came on the dash, battery lost power after about 10 seconds, screen went black, dash went black, car locked up, opened the hood and the engine was on fire, called 911 who came quickly and put the fire out without the entire car burning, insurance later total losses the car. I don’t know if it was the battery or the engine responsible for the failure, because the flames were on the engine and not the battery, but the incident was triggered by a battery warning. I was on the interstate driving 60mph when the car shut off and everything including my headlights and even hazard lights went black. Not only could I have been struck by a car on the interstate, I could have died in a car fire. Because the car locked up, I couldn’t open the trunk or use any electronics. The door could have just as easily locked and trapped us inside a burning car. The car is on a salvage yard, no attempt to replicate has been made. Progressive insurance, and columbia fire inspected it and found that it was undetermined. “charge service system now” was the only warning before the infotainment screen shut down to reduce battery usage. Every light on the dash flashed right before everything on the dash went black and power was lost to the entire vehicle.

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Have a 2019 Ford Mustang 2dr 2. 3l ecoboost with 59,500 miles which I took to the dealership with a code p0302 and p0304 present, cylinder misfire, observed coolant level low, performed borescope in cylinder 2 and 4, found coolant intrusion, recommend long block engine replacement which would have cost me $10,728. 85. Concern is that the engine can stall suddenly and may cause an accident. Ford motor company knows about these kind of engine issues with ecoboost engines and have not offer any reasonable solutions. Vehicle VIN is the following: [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

2016 Ford Mustang 2. 3l ecoboost engine. Coolant intrusion into the cylinder. It's a known issue, an engine block design flaw. Ford was replacing the whole engine when those cars were under warranty. There is extensive content online about it and dozens of class actions.

My 2018 Ford Mustang ecoboost experienced sudden engine failure at 70,915 miles. The dealership documented misfire codes p0300, p0301, and p0316, which match the known 2. 3l ecoboost coolant-intrusion defect. This defect causes loss of power, rough operation, misfires, and potential stalling, creating a safety risk during driving. Ford customer relationship center instructed me that the dealership must escalate the defect to the regional field service engineer. However, the dealer refused to do so, leaving the failure unresolved. This appears to be part of a widespread safety-related defect involving 2. 3l ecoboost engines, with risk of sudden loss of power, stalling, and internal engine failure.

At about 75k miles my Mustang started misfiring at about 2,500 rpm’s and higher. Turns out it was a blown head gasket. This engine model is prone to what happened to it. Ford should have a recall for these engine and a solution as they’re ticking time bombs. I wish I could drive with the peace of mind of not worrying about it. I couldn’t drive my car for months because of the warranty not even wanting to cover it. The warranty from the used car dealership. Got unlucky.

Ford's 2. 3l ecoboost engine defect that causes coolant to leak into the cylinders, leading to engine failures and potential fire risks.

Purchased just 2 months ago from Ford dealer, after 1 week noticed shimming of engine on cold start, next incident overheat warning, filled with radiator fluid, noticed slow lowering of fluid level, next day car would not start at all. Towed to mechanic in which they report blown head gasket and all 4 cylinders damaged. After searching this site I found others had same complaint but no recalls. Evidently there is a lawsuit, how do I participate so I can get my beautiful car repaired ASAP?.

Blown 2. 3 ecoboost. At approx 4700 miles while driving got an engine light and severe misfire. Report from Ford technician says that part of a spark plug broke off in #4 cylinder and caused severe damage. Motor (long block) and turbo replaced under warranty and after 700 miles is running fine.

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I had the coolant gasket problem that resulted in having to get the engine replaced. It was a 202 Mustang ecoboost premium.

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Blown head gasket @ 86,000 miles due to block defect. Now I have to either pay to replace the head gasket with the expectation that it will fail again due to the block defect, or replace the whole defective block.

The evaporator is leaking and apparently is a known issue from Ford and they didn't report this. The evaporator core is leaking and it blows hot air for a good amount. It draws a lot of power form the system and drops the rpm below idling. Forcing me to rev a cold engine so that it does not stall out.

There is a coolant intrusion on my vehicle, which resulted in either cracking the engine block or head gasket. In turn, this has caused a costly repair on a car with only 56,000 miles on it. Ford is aware of the issues with these engines and the seals on them. It’s a 2018 ecoboost! it also happened to my mom’s ecoboost around the same mileage. This isn’t normal and Ford is literally turning a blind eye to a very serious issue which results in total engine failure. On top of that the repair for this issue is costing $12,000 to repair at the dealership. This is absolutely absurd for a company as big as Ford, to build a faulty engine and then not offer any support/recalls to help all of those affected by it, including me.

Engine - blown head gasket this is a common issue with these engines and is a costly repair or potential engine failure.

I am filing this complaint regarding a vehicle I purchased from florida fine cars in miami gardens on [xxx}. The vehicle is a Ford Mustang gt with a roush supercharger (VIN: [xxx] ). Immediately after purchase, the car exhibited serious performance and safety issues that were never disclosed by the dealer. Within hours of driving home, the vehicle showed severe power loss, hesitation during acceleration, and loud mechanical noises at highway speeds. These issues were not detectable during the brief, low-speed test drive the dealership provided. Additionally, by the next morning, the car emitted a strong plastic or chemical odor under the hood, which intensified in the florida heat — suggesting a possible engine, exhaust, or emissions-related fault. The dealer misrepresented the condition of the vehicle, repeatedly claiming it was “fully inspected” and “in excellent condition. ” however, a certified Ford dealership technician later confirmed that the car “ran like garbage” and required immediate diagnostic attention. These defects are potentially safety-related, as they directly affect the engine’s performance, drivability, and emissions integrity. The vehicle could stall, lose power during acceleration, or emit toxic fumes. Florida fine cars has refused to take responsibility, despite clear evidence that the car was sold with undisclosed defects. Their actions constitute false advertising, misrepresentation, and a disregard for consumer safety. I urge NHTSA to record this complaint and investigate whether similar vehicles sold by florida fine cars (or others with aftermarket superchargers) have unreported safety or emissions defects. This poses a serious risk to consumer safety and compliance with federal motor vehicle safety standards. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

While entering an on-ramp and just before merging onto the freeway the vehicle failed to accelerate and I lost complete power from the engine. The vehicle was still powered on, but produced no combustion from the engine. The check engine light illuminated and a message appeared on the dash stating to shift the vehicle into neutral. I pulled off on the shoulder and shifted the vehicle into park. I shut the vehicle off and started it back up. After doing so I had full power once again. This is the sixth time this has happened.

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• what failed & is it available for inspection? air-conditioning system failure. Loss of cabin cooling; dealer recommends compressor replacement (may include related components pending contamination check). Vehicle is at a Ford dealer now; no repairs performed yet. I requested the dealer retain failed parts for inspection. • how was safety put at risk? I live in las vegas; ambient temps ~112°f-120 degrees. This is my primary vehicle for transporting my [xxx] and for my work schedule. With no a/c, cabin temps become dangerously high within minutes, creating a heat-related illness risk (child and driver), impaired concentration, and fatigue during necessary trips. • has the problem been reproduced/confirmed? yes. An independent shop first advised compressor replacement. A Ford dealer subsequently confirmed loss of cooling and produced an a/c repair estimate after diagnosis. • inspected by manufacturer/police/insurance? inspected/diagnosed by an authorized Ford dealer. I opened a Ford customer relationship center case (xxx) and requested goodwill/after-warranty review. No police/insurance inspection. • warning lamps/messages/symptoms & onset? no warning lights. Symptoms began with weak/intermittent cooling in early August 2025 and progressed to no cold air. Mileage at failure ~87,279. A/c clutch cycles but cabin air remains hot. (owner context: original owner, [xxx] vehicle: 2016 Ford Mustang gt 5. 0. ) information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I purchased this 2019 Ford Mustang ecoboost 2. 3l brand new in July 2019. It has been well maintained, regularly serviced by the authorized Ford dealer where I purchase the car. It has never been in an accident, and has only 36,100 miles. This vehicle passed inspection last month. The check engine light came on, and then had rough cold starts. I have been informed by the service station that antifreeze is leaking into the engine, and a new engine is required (estimated cost of $11,000). After researching this matter, it appears that there is a design flaw with this vehicle, given the high number of similar occurrences with 2015-2019 Ford ecoboost vehicles. It is my understanding there is even a class action lawsuit related to this issue. Luckily, there was no accident resultant from this engine malfunction in my case, but the NHTSA should investigate this issue, given the high risk it poses to highway safety!.

On repair order #:[xxx] at lorenzo Ford, the dealership technician documented the following: “verified customer concern, dtc p0304 perform pinpoint test, inconclusive, perform coolant pressure test and found coolant intrusion into cylinder 4. ” this confirms a coolant intrusion defect causing misfire and overheating — exactly the well-documented issue affecting 2. 3l ecoboost engines that is now the subject of a pending class action lawsuit (filed June 2025). Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Check engine light on. Code is p0301 for multiple cylinder misfires. At startup I can hear coolant sloshing around and white exhaust. Coolant is leaking into cylinder 1. The Ford dealer says it needs a new engine. 2019 Ford Mustang ecoboost at 55k miles.

See attached document for complaint.

The coolant over temperature warning light of my 2016 Ford Mustang ecoboost came on and the engine immediately went on limp mode and I stopped the vehicle and switched off the engine. The vehicle quickly lost power and this created safety concern for other drivers who would have bumped me. I towed the vehicle to the nearest Ford dealership for inspection and they found that coolant went into the engine and the coolant bottle was empty. As a result the dealership has said that the engine engine needs to be replaced…. A big shock for me as I have never had any prior issue with this car which is only 59k illegal on the clock. After further research of my own, this seems to be a common issue with Ford ecoboost engine before year 2020. What surprises me is that there was no other indication or warning before this incident which could have obstructed me to take precautionary action.

Coolant intrusion into the cylinder head. This caused a sudden halt of he vehicle which could have caused an accident and loss of life. The engine coolant overheating temperature warning light came on. Vehicle was inspected by Ford dealership and found to have blown head gasket. The car is vat for inspection.

Since purchasing the vehicle (used) there had been several issues with the engine.

The contact owns a 2018 Ford Mustang. The contact stated that upon starting the vehicle, there was an abnormal knocking sound coming from the engine compartment. Upon inspecting the vehicle, the contact found oil underneath the engine compartment. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was notified of the failure. The failure mileage was 49,000.

My vehicle experienced a blown head gasket due to a faulty engine block design at 56k miles. The car started running rough for 10 seconds upon a cold start up and was also misfiring. This is due to coolant intrusion through the gasket and it got into cylinder 3 which could have caused catastrophic engine failure or worse. There are several class-action lawsuits against Ford for the defect. Ford has not taken any steps to address this issue with the ecoboost engines on 2015-2019 models. Additionally, Ford did not provide relief to me and I had to pay out of pocket to fix this.

My 2021 Ford Mustang ecoboost is currently experiencing an ongoing issue with the evap purge valve, a critical emissions component. The vehicle suffers from stuttering, rough idle, and a check engine light, especially immediately after refueling, where the engine has stalled multiple times—posing a serious safety risk during traffic re-entry and acceleration. The purge valve has not been replaced, and the issue remains unresolved. I contacted Ford customer relations and three separate Ford dealerships, all of which refused to service the vehicle under warranty, despite the fact that it is still covered under the federal emissions warranty (8 years/80,000 miles) and the powertrain warranty. This refusal contradicts federal warranty guidelines, as the purge valve is clearly part of the evaporative emissions control system. The failure disrupts vapor flow and fuel trim stability, leading to erratic engine behavior and emissions system malfunction. I previously owned another Ford Mustang ecoboost while living in a different part of the state, and that vehicle experienced the exact same purge valve issue, including stalling after refueling and triggering the check engine light. This recurring failure across multiple vehicles suggests a design flaw or supplier defect that Ford has failed to address. There are hundreds of documented complaints and videos online, including on youtube and Mustang forums, showing other owners experiencing the same purge valve failure and warranty denial. This suggests a systemic issue that Ford is aware of but continues to ignore. I believe this issue warrants investigation for warranty non-compliance, emissions system reliability, and potential recall consideration due to the safety and environmental risks involved.

The engine on this 2016 Mustang gt is a 5-liter v-8. The 2015-2017 model years were equipped with plastic valve covers. This is a known defect with these vehicles. The plastic valve covers warp/melt/distort over time, causing motor oil to leak in significant amounts onto the exhaust manifold creating smoke and odor. There is a potential for fire in the engine compartment because of this leak. Ford issued a service bulletin regarding this known defect but has not as yet issued a recall.

The contact owns a 2017 Ford Mustang. The contact stated that after the vehicle was started in the morning, the vehicle was idling rough. The contact stated that later while driving at various speeds, there was a misfire coming from the engine. The contact stated that while checking the engine oil level, the contact became aware that the coolant reservoir level was low. The contact refilled the coolant reservoir however, the engine misfire continued. The contact had taken the vehicle to a local dealer who diagnosed the vehicle and determined that there was coolant intrusion into the cylinders, and that the engine needed to be replaced. The vehicle was not repaired. The contact notified the manufacturer of the failure and was referred by the manufacturer to contact the NHTSA safety hotline to report the failure. The failure mileage was 115,288.

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My engine began experiencing misfires at around 40,000 miles. They were on and off. The check engine light would pop up and go away for around a month. Then the vehicle began having a rough start and check engine light would not go away. I sent the vehicle back to the dealer where they determined that my engine was having misfires due to a coolant leak into cylinder one, stemming from a poor engine design. The engine needed to be replaced. The repair was covered under my warranty.

Coolant intrusion into cylinder/cylinders problem confirmed by a dealer check engine light, cylinder 1 missfire is when I noticed an issue.