Buying a used Ford Focus RS (Mk3, 2016–2018) is a thrilling prospect for any driving enthusiast, but it requires careful homework. While it is a "four-door super hatch" with 350 hp and advanced all-wheel drive, certain mechanical pitfalls and ownership histories can turn a dream car into a financial nightmare.
The most infamous issue with the Focus RS concerns the head gasket in .
These models typically have the corrected head gasket from the factory but lack the 2018's LSD and specific cosmetic bits like the black roof and mirrors. 3. Common Mechanical Issues & Maintenance
Widely considered the "best" and most reliable year. It came from the factory with the correct head gasket, revised dampers for a slightly better ride, and a standard Quaife limited-slip differential (LSD) on the front axle. Only 1,000 were made for North America, so they command a premium price.
Beyond the head gasket, keep an eye on these common "Focus quirks":
A manufacturing mix-up led to the installation of head gaskets intended for the Ford Mustang EcoBoost, which has a different cooling passage design.
Ford issued a service action to replace the gaskets (and sometimes the entire cylinder head). When buying, verify that this work was completed via service records or by checking the VIN with a Ford dealer. 2. Best Years to Buy
This flaw causes coolant to burn, leading to white smoke from the exhaust, misfires, and potentially catastrophic engine failure (hydrolock).
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