Suzuki Swift 1.2 Mk4

The 2010-2017 Swift has a well-documented design issue where foam filler applied inside the sills during production traps water, particularly in the area just ahead of the rear wheel arch. Corrosion develops from inside outward, so the paint can appear fine on the surface while the structural steel underneath is rusting. Early cars (2010-2013) are most susceptible, with UK MOT data showing a notable uptick in corrosion-related failures for these years. Inspection is best done with a borescope through the drain holes or by removing plastic clips to see inside the sills. Repair costs range from around €300 for a localized patch to €1,200 or more if both sills require significant welding and repainting. Suzuki's perforation warranty is typically 6 years, which has expired on all Mk4 models. Preventive cavity wax treatment is strongly recommended.

The steering rack has an internal end bushing that wears over time, allowing the rack to move within its housing. This produces a distinct knocking or clunking noise when driving over bumps, particularly at low speeds. Suzuki acknowledged the issue and upgraded the bushing design for 2015-2017 models, but the revised part also wears eventually, just after a higher mileage. Aftermarket polyurethane bushings from Powerflex and similar brands offer a longer-lasting solution at around €30-50 for the parts. A workshop replacement of the bushing typically costs €200-400 at an independent garage. Full steering rack replacement is rarely needed but costs around €400-600 with a remanufactured unit fitted.

The caliper slider pins on both front and rear calipers are prone to seizing, particularly on cars driven in regions with road salt. When pins seize, the caliper cannot float freely, causing one brake pad to wear much faster than the other and the car to pull under braking. The pins cost around €20 per caliper to replace. If caught early, cleaning and re-greasing with copper or silicone grease at each service is sufficient. If neglected and the caliper piston has seized, a replacement caliper costs around €250-350 per side fitted. Annual slider pin maintenance during brake inspection prevents the issue entirely.

Some 2010-2017 Swifts develop an audible squeak from the front suspension, caused by worn or dried-out rubber bushes in the lower control arms or anti-roll bar mounts. The noise is most noticeable at low speeds over speed bumps. The anti-roll bar bush torque is critical: too tight and they squeak, too loose and they clunk. A temporary fix is applying silicone grease to the bushes. The proper fix is replacing the affected bushes or the complete control arm, costing around €120-250 at an independent garage. The repair is straightforward and parts are widely available.

The K12B uses individual coil-on-plug ignition coils. While generally durable, they can fail on higher-mileage cars, typically beyond 120,000 km. Symptoms include engine misfires, rough idle, and a check engine light. If a coil fails and allows unburned fuel into the exhaust, it can damage the catalytic converter over time. A single aftermarket coil costs around €30-50. Replacing all four coils plus spark plugs preventively costs around €200-300 at an independent garage. This is a relatively rare issue on the Swift and falls more into the category of normal high-mileage wear.