P0300 on FORD MUSTANG
What P0300 Means on Your FORD MUSTANG
Real FORD MUSTANG Owner Reports (Source: NHTSA Complaints Database)
"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."
"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."
"Piston slap noise from engine. ticking and thudding noise from idle to 2500 rpms. can hear diesel type sound inside the car when at idle. check engine light with code p0300 for engine misfire. car is 1 year old and has oil consumption issues. dealer is of no help saying all these are normal."
"Began over last month with difficulty or rough engine start in mornings Then engine overheated once and continues to lose coolant without visible sign of any leakage. Scan error codes P0300, P 0303, P 0304. Now with excessive steam/smoke out tail pipe when it’s started."
Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.
Common Causes of P0300 on FORD MUSTANG
Percentages based on NHTSA complaint component analysis for this vehicle.
Complaint Trend by Year
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50-$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2-3 quotes. Dealer vs independent shop prices often differ 30-50% for the same repair.