Mustang reliability has improved dramatically since the 2015 S550 redesign. The worst recent years are the 2015 launch with its new IRS and the all-new 2024 S650 launch. Older 2005-2010 S197 cars also had documented issues.
Avoid: 2015 launch and 2024 S650 launch
Buy Instead: 2018-2020 Mustang GT
Scores 1-10 based on NHTSA complaint volume, severity of reported issues, recall history, and class-action exposure. Higher is better.
| Year | Score | Summary | Top 3 Problems | Verdict |
|---|---|---|---|---|
| 2005 | 6/10 | S197 launch. 4.0L V6 timing chain issues begin. | · 4.0L timing chain tensioner Solid rear axle clunk Door window track |
CAUTION |
| 2011 | 7/10 | Coyote 5.0L introduced. Few launch issues. | · 5.0L valve cover leak MT-82 shift Cracked dashboard |
CAUTION |
| 2015 | 7/10 | S550 launch. New IRS, EcoBoost. | · IRS knuckle TSB EcoBoost head gasket MyFord Touch |
CAUTION |
| 2016 | 7.5/10 | Year 2 of S550. Fewer issues. | · IRS clunk EcoBoost head gasket (rare) Sync 3 bugs |
CAUTION |
| 2017 | 8.5/10 | Gen 3 Coyote, 10R80 launched. | · Early 10R80 shift quality EcoBoost oil leak Headlight DRL |
BUY |
| 2018 | 9/10 | Refresh. Mature 10R80. | · Minor electronics 10R80 minor Recall 18V-595 |
BUY |
| 2020 | 9/10 | Best S550. | · Minor electronics Cluster sensor Battery drain |
BUY |
| 2024 | 7/10 | S650 launch year. | · SYNC 4A glitches Digital cluster Software recalls |
CAUTION |
Coolant intrusion at head gasket on early 2.3L EcoBoost Mustangs. White smoke, milky oil, misfires. Ford extended warranty for some VINs.
More on this issue →Cologne 4.0L SOHC timing chain tensioner failure causes catastrophic chain skip. Ford TSB 07-26-3. Affects S197 V6 Mustangs.
More on this issue →Multiple software recalls in the first year of S650. Digital cluster freezes, SYNC 4A reboots. Most are software fixable but indicate launch-year risk.
More on this issue →Harsh 1-2 shifts and shudder on early 10-speeds. Ford TSB 18-2275 updated calibration.
More on this issue →Independent rear suspension knuckle bushings develop clunk over time. Aftermarket poly bushings fix it.
More on this issue →Roll-away risk on 10R80 if park pawl fails to engage. Affects some 2018-2019 Mustangs.
More on this issue →Run a $5.99 AI diagnosis tailored to your exact vehicle. Get the most likely cause, repair estimate, and OBD2 code interpretation in under 30 seconds.
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The 2005-2010 S197 V6 cars (timing chain) and 2015 S550 launch (IRS, EcoBoost head gasket) are the worst recent years. The 2024 S650 launch has elevated complaints but is too new to fully judge.
It is the riskiest S550 year. Launch-year IRS knuckle bushings, MyFord Touch infotainment glitches, and 2.3L EcoBoost head gasket complaints all peak here.
Yes, Ford issued an extended warranty (10 yr/150,000 miles) on affected 2.3L Mustang and Focus RS VINs. Confirm coverage was applied before buying used.
It is a launch year with multiple software recalls. If you want an S650, wait for 2025 model year for sorted software.
The 3.7L Cyclone V6 in 2011-2017 cars is reliable. The earlier 4.0L Cologne V6 had timing chain tensioner failures.
A maintained Gen 1-3 Coyote routinely passes 200,000-250,000 miles. Some track-driven cars have logged over 300,000 on stock internals.