2020 ACURA MDX

Typical onset: 30,000-80,000 mi

Symptoms: blue smoke on startup or acceleration, oil consumption exceeding 1 qt per 1,000 mi, rough idle, misfires, eventual catastrophic engine failure if ignored

Fix: This is a manufacturing defect in certain engine batches — rings don't seat properly, leading to blow-by and oil burning. Fix requires complete engine rebuild (pistons, rings, often main/rod bearings) or short-block replacement. 20-30 labor hours depending on approach. Some cases covered under extended warranty or goodwill if caught early and owner has service records.

Estimated cost: $6,000-12,000

Typical onset: 40,000-90,000 mi

Symptoms: shudder or vibration during 2-3 or 3-4 upshift, especially under light throttle, hard downshifts when slowing, hesitation from stop

Fix: The ZF 9HP is notorious for torque converter shudder and adaptive learning issues. First-line fix: triple fluid flush with Honda DW-1 ATF and software update (2-3 hours). If that fails, torque converter replacement or full trans overhaul. Transmission oil cooler lines also leak and contaminate fluid, accelerating issues — inspect and replace cooler if seeping (add 1.5 hours).

Estimated cost: $400-800 for flushes and cooler; $3,500-5,500 for torque converter or rebuild

Symptoms: no-start condition, engine stalling at speed, rough running, stumbling under load, check engine light with low fuel pressure codes

Fix: Denso fuel pump impeller defect — can crack and cause sudden failure. Covered under recall, but if you bought used and recall wasn't done, you're stuck with a tow and possible secondary damage (injectors running lean). Pump replacement: drop tank, 3-4 hours labor. Check recall status by VIN before purchase.

Estimated cost: $800-1,200 if not covered by recall

Symptoms: airbag light on dash, passenger airbag 'OFF' indicator lit with adult in seat, intermittent airbag warning chime

Fix: Recall 21V-026 covers faulty occupant classification ECU. Software or ECU replacement, 1 hour. If not addressed, airbag may not deploy in a crash. Should be free under recall, but verify it was completed.

Estimated cost: $0 if recall done; $500-700 otherwise

Typical onset: 70,000-110,000 mi

Symptoms: clunk when shifting into drive or reverse, excessive vibration at idle in gear, engine 'rocking' during acceleration

Fix: Hydraulic transmission mount (lower rear) and front engine mounts deteriorate, especially if driven aggressively or in stop-and-go traffic. Transmission mount alone: 1.5 hours. Front mounts add another 2 hours if doing all at once. Use OEM Honda mounts — aftermarket rarely lasts.

Estimated cost: $400-900 depending on how many mounts

Symptoms: soft or spongy brake pedal, pedal sinks slowly to floor when held at stops, longer stopping distances, brake warning light

Fix: Internal seals can degrade prematurely, causing loss of hydraulic pressure. Covered under recall — master cylinder replacement, 2-3 hours including bleeding. Critical safety issue; verify recall completion before buying used.

Estimated cost: $0 if recall done; $600-1,000 otherwise