2017 HONDA N-BOX

Typical onset: 80,000-120,000 mi

Symptoms: Cold-start rattling that persists 3-5 seconds, Check engine light with P0011/P0021 (cam timing codes), Rough idle especially when warm, Gradual loss of power on acceleration

Fix: The S07B engine's timing chain tensioner and guides wear prematurely, often combined with hydraulic lifter collapse. Full job requires timing chain kit, lifters, cam seals, and valve cover gasket. 6-8 labor hours because of the tight engine bay. If lifters damaged the cam lobes, add camshaft replacement (another 2-3 hours).

Estimated cost: $1,800-3,200

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid leaking from radiator area, Coolant contaminated with ATF (strawberry milkshake appearance), Slipping or shuddering during acceleration, Overheating warnings on dash

Fix: The external CVT oil cooler develops pinhole leaks or internal cracks, sometimes allowing cross-contamination with engine coolant. Requires cooler replacement, full CVT fluid flush (3x minimum), and coolant system flush. If contamination occurred, CVT may need replacement. Cooler repair alone: 3-4 hours. CVT replacement if damaged: 8-12 hours.

Estimated cost: $800-1,400 cooler only, $3,500-5,500 with CVT replacement

Typical onset: 90,000-140,000 mi

Symptoms: White smoke on cold start that clears after warmup, Coolant loss with no visible leaks, Overheating under load, Misfires on multiple cylinders, Oil in coolant reservoir

Fix: Small turbo engines with thin aluminum heads are prone to warping between cylinders 1 and 2. Head needs removal, resurfacing (often .008-.012 inches), and all gaskets/seals replaced. If warped beyond spec, new head required. Testing shows these heads often warp from repeated short trips without proper cooldown. 10-14 labor hours for full job including head R&R and resurface.

Estimated cost: $2,200-3,800 with resurface, $3,500-5,000 with new head

Typical onset: 60,000-90,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle in gear, Shuddering during acceleration from stop, Visible sagging of engine/transmission assembly

Fix: The rear transmission mount uses soft rubber that degrades quickly, especially in hot climates. Front engine mount often fails simultaneously. Both should be replaced together. 2-3 labor hours for both mounts. Not difficult but requires supporting powertrain properly in tight kei-car engine bay.

Estimated cost: $400-700

Typical onset: 100,000-150,000 mi

Symptoms: Severe vibration at specific RPM ranges (usually 2,000-2,500), Squealing from serpentine belt, Visible wobble on crankshaft pulley, Accessory belt throwing off

Fix: The rubber isolation ring in the harmonic balancer deteriorates and separates from the hub. If it grenades, it can take out the crank sensor, timing cover, or oil pump drive. Replacement requires removing passenger-side engine mount and working in cramped quarters. 3-4 labor hours.

Estimated cost: $600-1,000

Symptoms: Hard starting when fuel tank below 1/4, Hesitation or stumbling during acceleration, P0087 code (fuel rail pressure too low), Loss of power uphill or under load

Fix: Japanese-market vehicles often arrive with partially clogged fuel filters if they sat before export. The in-tank fuel pump assembly includes the filter, requiring tank drop. Common preventive maintenance on imported examples. 2-3 labor hours.

Estimated cost: $350-600