2021 Ford Mustang: check engine light

Filed Mar 6, 2026 · Engine, Transmission · CA

A steady Check Engine Light came on after starting the car; brought it to Ford Dealer of Montebello and they stated coolant leak and got into one of the cylinders that caused misfires.

Filed Feb 26, 2026 · Fuel system · 13,000 miles · VA

The contact owns a 2021 Ford Mustang. The contact stated that in May 2025, there was a misfire in the engine after refueling with warm fuel. The check engine warning light was flashing on the instrument cluster. The contact later received notification of the federal safety agency Campaign Number: 25V455000 (Fuel System, Gasoline); and associated the misfire with the recall. The local dealer was contacted, and the contact was informed that the recall repair was not yet available. The vehicle was not repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not informed of the failure. The failure mileage was approximately 13,000.

Filed Feb 4, 2026 · Fuel system · HI

At highway speed (60-65mph), in 6th gear, cruise control activated, the car began to surge and stall and loose power. Applying more throttle to maintain speed did not help. Pulled to roadside and engine stalled. No check engine light at that time. Re-started with rough idle, check engine light illuminated, attempted to drive again but there was no power, vehicle stalled again. Tried to crank again with crank-no start, check engine light on. Car had approx. 1/4 tank fuel and range of 80 miles to empty. Had to tow. After towing home about 2 hours post-incident, car is still crank-no start. Scanned for codes: P0087:00- 64, P008A:00-EC, P00C6:00-26, P008A:00 fuel pressure low codes.

Filed Jan 7, 2026 · Fuel system · 44,878 miles · GA

The contact owns a 2021 Ford Mustang. The contact stated that while driving at various speeds, the accelerator pedal was depressed, the vehicle hesitated and the engine misfired, and the vehicle failed to respond as needed. The contact stated that the check engine warning light was illuminated. The contact called a local dealer and was advised that there was a recall associated with the VIN under the federal safety agency Campaign Number: 25V455000 (Fuel System, Gasoline). The contact was advised by the dealer that the remedy was not yet available. The contact stated that the failure was a recurring failure. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not informed of the failure. The failure mileage was 44,878.

Filed Aug 25, 2025 · Engine, Fuel system · MI

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.

Filed Jul 22, 2025 · Engine, Fuel system · WI

The contact owns a 2021 Ford Mustang. The contact received notification of the federal safety agency Campaign Number:25V455000 (Fuel System, Gasoline); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that after storing the vehicle in storage for the winter and connecting a battery retainer, the check engine warning light temporarily illuminated for one day. The dealer was contacted and was unsure when parts would be available. The contact called another dealer, Evansville Ford (428 N Union Rd, Evansville, WI 53536); who was unable to confirm when parts would be available. The manufacturer was not made aware of the failure. The failure mileage was approximately 21,000. VIN tool confirms parts not available.

Filed Jul 11, 2025 · Engine, Fuel system · FL

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.

Filed Dec 21, 2023 · Electrical, Fuel system · OR

Check engine light keeps coming on even after dealer says it is fixed. Keeps throwing codes evaporative emission system problem.

Filed Jun 15, 2022 · Engine · 700 miles · FL

The contact owns a 2021 Ford Mustang. The contact stated that immediately after purchasing the vehicle new, the engine experienced random misfire, causing the vehicle to lose motive power and acceleration. During the failure, the check engine warning light was illuminated. The vehicle was taken to the local dealer who reprogrammed the engine computer and replaced the camshaft sensor however, the failure persisted. The manufacturer was notified of the failure. The failure mileage was 700.