The 2006 Altima is plagued by catastrophic CVT failures and serious engine oil consumption issues on the 2.5L four-cylinder, making it one of Nissan's most problematic mid-size sedans from this era.
CVT Transmission Failure (RE0F10A)
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Shuddering or jerking during acceleration, especially 15-40 mph, Whining or grinding noise from transmission, Hesitation when accelerating from stop, Transmission overheating warning light, Complete loss of forward gears
Fix: CVT replacement is the only real fix once symptoms appear. Transmission fluid changes don't prevent failure on this generation. Expect 8-12 hours labor for R&R. Remanufactured units common due to cost of new.
Estimated cost: $3,500-5,500
QR25DE Engine Oil Consumption / Piston Ring Failure
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Burning 1+ quart of oil every 500-1,000 miles, Blue smoke from exhaust on cold start or acceleration, Fouled spark plugs, misfires on multiple cylinders, Low oil pressure warning at idle when oil level drops, Carbon buildup causing rough idle
Fix: Piston rings are undersized from factory and fail prematurely. Requires complete engine rebuild or replacement. Many owners run it low and seize the engine. Short block replacement is 18-24 hours, full rebuild 25-30 hours.
Estimated cost: $4,000-7,000
Crankshaft Position Sensor Failure
Common · medium severityTypical onset: 70,000-130,000 mi
Symptoms: No-start condition, cranks but won't fire, Intermittent stalling while driving, especially when hot, Check engine light with P0335 or P0340 codes, Engine dies and restarts after cooling down
Fix: Sensor itself is cheap but labor-intensive on the 2.5L due to location behind timing cover area. 2.5 hours labor typical. The 3.5L V6 is easier at 1.5 hours.
Estimated cost: $250-450
Front Lower Control Arm Bushing Failure
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking noise over bumps from front end, Steering pulls to one side, won't hold alignment, Excessive tire wear on inside edge, Steering wheel off-center after hitting bumps
Fix: OEM bushings are weak rubber. Most replace entire control arms instead of pressing bushings due to labor cost. Both sides typically need replacement at same time. 3-4 hours for both sides including alignment.
Estimated cost: $500-800
Catalytic Converter Failure (Pre-Cat)
Occasional · medium severityTypical onset: 100,000-150,000 mi
Symptoms: Check engine light with P0420/P0430 codes, Rattling noise from exhaust on startup or acceleration, Loss of power, sluggish acceleration, Failed emissions test, Sulfur smell from exhaust
Fix: Pre-cats in the manifold fail on both engines. Aftermarket manifolds with cats available but quality varies. OEM is exhaust manifold and cat as one unit. 4-6 hours labor for manifold replacement on 2.5L, 5-7 hours on V6.
Estimated cost: $800-1,800
Transmission Cooler Line Corrosion
Occasional · medium severityTypical onset: 80,000-140,000 mi
Symptoms: Transmission fluid leak visible under vehicle, Pink or red fluid dripping from radiator area, Low transmission fluid warning, Transmission slipping or delayed engagement after leak develops
Fix: Steel lines corrode where they connect to radiator, especially in salt-belt states. Lines should be replaced not patched. Includes system flush. 2-3 hours labor.
Estimated cost: $400-700
Mass Airflow Sensor Contamination
Occasional · low severitySymptoms: Rough idle, hesitation on acceleration, Check engine light with P0101 or P0171/P0174 lean codes, Poor fuel economy, Stalling at idle or when coming to stop
Fix: MAF sensors get contaminated from oil vapors and cheap aftermarket air filters. Try cleaning with MAF cleaner first (0.3 hours), but often needs replacement. Easy DIY, 0.5 hours at shop.
Estimated cost: $150-350
Hard pass unless under $3,000 with full service records and confirmed low oil consumption—budget for CVT and engine replacement as when-not-if scenarios.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.