Credov's researched list of the 3 faults the Ford Mustang EcoBoost is known for (2015–2023), 3 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: Start the engine from cold and watch the exhaust for white, sweet-smelling smoke in the first minute.
Why it matters: A head gasket repair alone often fails again on the original slotted-deck block, and the lasting fix reported is a revised long block or short block, a major engine job.
What to look for: On the drive, make a firm 2-3 change at higher revs and feel for 3rd blocking or refusing to go in.
Why it matters: A gearbox that locks out of gear at speed can momentarily leave the driver without the gear they expect, and fixes reported range from a shifter bracket and fresh fluid to a clutch replacement or a full rebuild if synchros are worn.
What to look for: Come to a stop gently several times and feel for a clunk on the low-speed downshifts.
Why it matters: Ford's and specialists' diagnoses point to clutch drum sleeve movement, valve body wear and cross-leaks, and fixes range from a software update and relearn to a valve body or a full rebuild, so unresolved harsh shifting is worth pricing in.
Got a question about a Ford Mustang EcoBoost? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.