The G4KE is Hyundai and Kia’s 2.4-litre port-injected four-cylinder from the Theta II engine family, and it powered an enormous number of vehicles sold in Australia: the Hyundai ix35 and Santa Fe, the Kia Sportage and Sorento, and the Sonata and i45 among others. It is a simpler, generally more forgiving engine than its direct-injection sibling (the G4KJ), but it has a well-established set of weak points worth knowing about.
Know Your Engine: G4KE vs G4KJ
Both are 2.4-litre Theta II engines, but the G4KE uses multi-point injection (MPi) while the G4KJ uses direct injection (GDI). The GDI engine makes more power and attracted most of the recall attention worldwide; the MPi G4KE avoids the carbon build-up problems of direct injection but still shares the Theta II bottom end. The engine code is on the block and the build plate — check it before ordering anything, because the two engines do not interchange.
The Common G4KE Problems
- Oil consumption. The number-one issue. Piston ring wear lets consumption climb slowly — often unnoticed until the level is dangerously low between services. An engine run chronically low on oil is how most of the serious failures below begin. If yours uses oil, check it fortnightly.
- Big-end bearing wear and knock. The Theta II’s known Achilles heel. A deep, rhythmic knock that rises with revs means bearing material is gone and metal is circulating through the engine. Do not keep driving — here is why.
- Timing chain stretch. Rattle on cold start and a check-engine light for cam/crank correlation. A chain kit typically runs $1,200–$2,500 — worthwhile on an otherwise healthy engine.
- VVT (variable valve timing) rattle. Worn VVT gears cause a diesel-like clatter at idle; often addressed alongside the chain.
- Oil pressure warnings. Sometimes just a sensor or a blocked pickup screen — but on this engine, always investigate immediately rather than resetting the light.
What Fixing a G4KE Costs
- Timing chain and VVT kit: $1,200–$2,500
- Piston rings and bearings (engine out): $3,500–$6,500
- Full rebuild after a bearing failure: often uneconomical once crank machining and parts add up
- Reconditioned exchange G4KE, supplied and fitted: typically $4,500–$7,500 with a 12-month warranty
The catch with rebuilding a knocked G4KE is that bearing debris travels: oil galleries, pickup, pump and often the crank journals are all contaminated. That is why a professionally reconditioned engine — stripped, machined, and rebuilt with new wear parts on a checked crank — is usually the safer and often cheaper outcome than reviving the original block, as we cover in reconditioning vs rebuilding.
Check Recall and Warranty Coverage First
Theta II engines have been subject to major recall and extended-warranty programs, primarily for the GDI versions, but coverage varies by model, year and market. Before spending money, run your VIN through the manufacturer checker — our Australian recall guide shows how.
Replacement Done Properly
We stock reconditioned G4KE engines for ix35, Sportage, Sonata, Santa Fe and Sorento applications — see our reconditioned G4KE engine or browse the full engine range. Supply and fit in our Dandenong workshop typically has you back on the road in 2–3 days, or we ship Australia-wide to your mechanic with dispatch in 1–2 business days.
Hearing a knock, burning oil, or just want a second opinion? Call (03) 9630 0960 or send us the details — we will confirm the engine code from your VIN and quote the right reconditioned engine for your vehicle.
Related guide: G4KJ 2.4 GDI engine problems