2007 ACURA MDX

Typical onset: 80,000-150,000 mi

Symptoms: Excessive oil consumption (quart per 1,000 miles or worse), Blue smoke on startup or acceleration, Misfires on cylinders 1, 4, 5, or 6 (the VCM-affected bank), Fouled spark plugs every 10k-15k miles, Eventually progresses to low compression and catastrophic engine failure

Fix: Honda's Variable Cylinder Management system causes ring land carbon buildup and ring flutter on deactivated cylinders. Real fix requires engine teardown, honing cylinders, new piston rings on all six cylinders, deck resurfacing, and VCM reprogramming or delete. Figure 18-24 labor hours for a proper rebuild. Many shops go straight to used engine swap (12-16 hours) due to block scoring once it's advanced.

Estimated cost: $4,500-7,500

Typical onset: 90,000-140,000 mi

Symptoms: Harsh 2-3 or 3-4 shifts, especially when cold, Flaring between gears or slipping under load, Shuddering during light acceleration at 35-45 mph, Delayed engagement into drive or reverse, Check engine light with P0730, P0741, or gear ratio codes

Fix: The 5-speed automatic suffers from worn 3rd gear clutch packs and failing torque converter lock-up. Fluid changes help but don't prevent it. Needs full rebuild with updated clutch materials and torque converter replacement. Remanufactured units run 14-18 labor hours including R&R, plus core charge. Used transmissions are a gamble since most have the same mileage-related wear.

Estimated cost: $3,800-5,200

Typical onset: 100,000-150,000 mi

Symptoms: ATF leak visible under center of vehicle, Transmission running hotter than normal, Pink or red fluid dripping after parking, Low fluid warnings if equipped with sensor

Fix: Steel cooler lines corrode at the crimp fittings where they connect to rubber hoses near the radiator. Lines are dealer-only parts and require dropping the subframe for access to the rear connections. Count on 4-5 hours labor, and you're replacing both supply and return lines as a set because if one's gone, the other is close behind.

Estimated cost: $650-950

Typical onset: 80,000-120,000 mi

Symptoms: Excessive vibration at idle, especially with AC on, Clunking when shifting from park to drive, Shuddering during VCM activation (3-cylinder mode), Engine movement visible from driver seat during hard acceleration

Fix: Front and rear hydraulic mounts fail internally, and Honda's VCM makes it worse by creating uneven firing pulses. Front mount is 2 hours, rear is 3 hours due to subframe interference. Most techs replace both at once since they fail within 20k miles of each other. Aftermarket units are half the price of OEM but may transmit more NVH.

Estimated cost: $800-1,200

Typical onset: 90,000-130,000 mi

Symptoms: High-pitched whine when turning at low speeds, Groaning when steering wheel is at full lock, Power steering fluid leak from pump front seal, Intermittent heavy steering effort when cold

Fix: Pump bearings wear and the front seal hardens. Rack rarely fails on this generation. Remanufactured pump replacement is straightforward at 2.5-3 hours including system flush and bleed. Always check the high-pressure hose at the same time — it leaks at the crimp near the pump if original.

Estimated cost: $550-750

Typical onset: null

Symptoms: Whining or howling from rear on deceleration, Clunking when starting from a stop, Vibration at highway speeds that changes with throttle input, Milky or metallic differential fluid on drain

Fix: SH-AWD rear diff shares fluid with the transfer case, and the breather gets clogged causing water intrusion or the internal seals leak. If caught early (fluid change every 30k miles), you avoid bearing damage. Once it's howling, the diff needs teardown, bearing replacement, and sometimes gear set replacement. That's 8-12 hours. Prevention is everything here — this fluid service is skipped by most owners.

Estimated cost: $1,800-3,200