The 2006 S60 is a comfortable Swedish sedan undermined by fragile transmissions, PCV system failures that can grenade the engine, and a cascade of suspension/bushing wear. The 2.5T is more desirable but shares the same Achilles heels.
PCV System Failure Leading to Engine Oil Sludge and Piston Ring Damage
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (quart every 500-1000 miles), Blue smoke from exhaust on startup or acceleration, Check engine light with misfire codes, Oil in intake manifold and throttle body, Rough idle and loss of power
Fix: Volvo's PCV system clogs and creates crankcase pressure that forces oil past rings. Catch it early: PCV box replacement takes 2-3 hours. Ignore it and you're looking at piston ring replacement (12-16 hours) or short block swap (18-24 hours). Many engines are scrapped at this point due to bore glazing.
Estimated cost: $400-800 for PCV system; $4,500-7,500 for rings/pistons if caught late; $6,000-9,000 for short block
Aisin AW-55-50SN Transmission Oil Cooler Failure and Slipping
Common · high severityTypical onset: 70,000-120,000 mi
Symptoms: Pink coolant or milky transmission fluid (cooler leak mixing fluids), Delayed engagement into gear (2-3 seconds), Harsh or slipping shifts, especially 2-3 and 3-4, Transmission warning light and limp mode, Whining noise from transmission
Fix: The internal transmission oil cooler in the radiator fails and cross-contaminates coolant and ATF, destroying the transmission. External cooler bypass (2 hours) prevents it but doesn't fix existing damage. Once slipping starts, you need rebuild or replacement (12-16 hours for R&R plus rebuild cost). This is THE killer for these cars.
Estimated cost: $300-500 for external cooler bypass; $3,500-5,500 for used transmission replacement; $4,500-6,500 for rebuild
Transmission and Engine Mount Failure
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive/Reverse, Excessive engine movement visible under hood during acceleration, Vibration at idle that smooths out at higher RPM, Driveline shudder on throttle tip-in
Fix: The hydraulic transmission mount fails most often, followed by upper engine mount. Transmission mount alone is 2-3 hours; doing all mounts at once (recommended) is 4-6 hours. Use OEM or Lemförder—cheap aftermarket lasts 6 months.
Estimated cost: $600-1,200 for transmission mount; $1,200-2,000 for all three mounts
Front Lower Control Arm Bushings and Ball Joints
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps from front end, Wandering or imprecise steering, Inner edge tire wear, Vibration through steering wheel at highway speeds
Fix: Volvo pressed bushings into the control arms—they can't be replaced separately, so you buy complete arms. Front lower arms are 2-3 hours per side; most techs do both sides plus alignment (add 1 hour). Ball joints often need doing at the same time.
Estimated cost: $800-1,400 for both lower control arms with alignment; add $300-500 if ball joints are separate
Angle Gear (AWD Models) Leaking and Bearing Noise
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Gear oil leak visible on driveway under center of car, Whining or grinding noise that increases with speed, Vibration at highway speeds (worn bearings), AWD warning light in advanced cases
Fix: AWD models have an angle gear (transfer case) that develops seal leaks or bearing failure. Seal replacement is 3-4 hours if caught early. Bearing damage means replacement unit (6-8 hours). Common enough that it's a pre-purchase inspection must-check on AWD cars.
Estimated cost: $500-900 for seal replacement; $1,800-2,800 for angle gear replacement
ETM (Electronic Throttle Module) Failure
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Sudden limp mode with reduced power, Check engine light with throttle control codes (P2104, P2107), Idle surge or stalling at stops, No throttle response—car won't rev
Fix: The throttle body's internal electronics fail. It's a unit replacement (1.5-2 hours), and these must be programmed to the car with VIDA software. Used units are a gamble—many have the same failure brewing. This can strand you instantly.
Estimated cost: $800-1,400 for OEM replacement with programming
Good bones ruined by catastrophic transmission and PCV issues—only buy if those are already addressed and you have a trusted Volvo indie nearby.
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.