2017 DAIHATSU BOON

Typical onset: 80,000-130,000 mi

Symptoms: Rattling noise on cold start that diminishes after 10-15 seconds, Check engine light with timing correlation codes (P0016, P0017), Rough idle or hesitation during acceleration, Metallic grinding from front of engine at high mileage

Fix: Replace timing chain, tensioner, guides, and usually the oil control valve. The 1KR-FE has a reputation for stretching chains when oil changes are delayed beyond 5,000 mi. Job requires front-end disassembly and careful cam timing. Budget 6-8 hours labor.

Estimated cost: $800-1,400

Typical onset: 70,000-120,000 mi

Symptoms: Persistent ticking or tapping from valve cover, especially on startup, Noise does not go away after engine warms up, Loss of power or misfires in severe cases, Noise worsens with low or dirty oil

Fix: The 1KR-FE uses bucket-over-shim lifters that wear or stick when oil quality degrades. Often requires cylinder head removal to replace all lifters and check cam lobe wear. Some techs attempt flush treatments first, but replacement is the lasting fix. Expect 8-10 hours for full head R&R and lifter replacement.

Estimated cost: $1,200-2,200

Typical onset: 90,000-140,000 mi

Symptoms: Transmission slipping or shuddering during acceleration, CVT overheat warnings or limp mode on highway drives, Burnt smell from transmission fluid, Delayed engagement when shifting from Park to Drive

Fix: The small CVT oil cooler on these units clogs with debris from worn belts or pulleys, causing overheating and accelerated wear. Proper fix involves cooler replacement, full fluid flush, and often a CVT filter change. If caught early, can avoid belt replacement; if ignored, full CVT replacement is next. 4-6 hours labor for cooler and flush.

Estimated cost: $600-1,100

Typical onset: 60,000-100,000 mi

Symptoms: Clunking when shifting from Reverse to Drive, Excessive vibration at idle, especially with A/C on, Visible engine movement when revving in Park, Rubbing or banging noises over bumps

Fix: The engine and transmission mounts on the Boon are small rubber units that degrade in hot climates or with spirited driving. Front and rear mounts fail most often. Straightforward replacement, 1.5-2.5 hours labor depending on access.

Estimated cost: $200-450

Typical onset: 100,000-150,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Oil residue around head gasket seam, Overheating in severe cases

Fix: The 1KR-FE can develop minor head gasket leaks, often external seepage rather than full combustion chamber breach. Some techs see warped heads on units that overheated. Requires head removal, resurfacing, and new gasket set. Often combined with timing chain and lifter service if mileage is high. 9-12 hours total labor.

Estimated cost: $1,500-2,800

Typical onset: 80,000-120,000 mi

Symptoms: Hesitation or stumbling during acceleration, Rough idle or stalling when fuel level is low, Hard starting after sitting overnight, Check engine light with lean fuel codes

Fix: The in-tank fuel filter on these cars is often overlooked and clogs with sediment, especially in markets with poor fuel quality. Requires dropping the fuel tank to access. Some owners also see fuel pump wear at similar mileage. 2-3 hours labor for filter, add 1 hour if pump replacement is needed.

Estimated cost: $300-650