Volvo XC90 1

Volvo's first five-cylinder turbodiesel with 2.4-litre common-rail injection. DOHC with 20 valves and Bosch EDC injection. Good torque delivery for comfortable cruising speeds; sensitive to fuel quality at high injection pressure.

• !! Injector seal leaking (Black Death) from 120,000 km

  The copper ring seal under the injectors fails to seal properly. Hot exhaust gas escapes, burning oil and forming black soot crusts around the injectors — known as Black Death.

  Symptoms: Black soot crusts visible around injectors, diesel/exhaust smell in engine bay, misfires, rough engine running.
  200–1,200 $
  Ad fuel injectorn-seal kit Volvo D5244TKupferdichtring D5 fuel injectorfuel injectorn-Klemme kit Volvo D5
• !! Timing belt + water pump from 160,000 km

  Replace timing belt every 160,000 km or 10 years. Water pump is belt-driven — if the old pump blocks after a belt change, the new belt is destroyed immediately. Always replace together.

  Symptoms: No warning signal. Missed service or old pump leads to engine damage.
  450–750 $
  Ad timing belt D5244Ttiming beltsatz Volvo D5 2.4Volvo water pump D5244T
• !! EGR valve sooted from 120,000 km

  EGR valve becomes clogged with soot particles and carbon deposits. When stuck closed power drops; when stuck open the engine runs rough and smokes.

  Symptoms: Power loss, rough idle, increased fuel consumption, black smoke, P0400 fault code.
  200–700 $
  Ad EGR valve D5244TEGR valve Volvo D5 2.4Volvo EGR cleaning

+ 1 more engine weaknesses + vehicle weaknesses

Upgraded D5 generation with 136 kW and increased injection pressure for improved torque of 450 Nm. Variable turbine geometry for improved response. Reliable with regular oil care; check the particulate filter on later versions.

• !! Injector seal leaking (Black Death) from 130,000 km

  The copper seal under the piezo injectors no longer seals properly. Combustion gases escape, burn the engine oil, and form black carbon crusts around the injectors — costly problem on the D5244T4.

  Symptoms: Black crusts around injectors, soot smell in engine bay, misfires, power loss, increased fuel consumption.
  300–1,500 $
  Ad fuel injector gasket D5244T4Volvo D5 185PS fuel injectorgasketfuel injectorn-Klemme kit XC90 D5
• !! Swirl flap linkage breaks from 150,000 km

  The plastic swirl flap linkage in the intake manifold fatigues and breaks. Loose parts can be sucked into the combustion chamber and damage valves or pistons. Damage up to €5,000 possible.

  Symptoms: Check engine light, power loss, rattling noise from intake area, in worst case engine damage.
  200–5,000 $
  Ad swirl flap linkage D5244T4Drallklappe Volvo D5 185PSintake manifold D5244T4
• !! Timing belt + water pump from 160,000 km

  Replace timing belt every 160,000 km or 10 years. Water pump must be changed at the same time without exception. New belt with old pump is a frequent cause of immediate consequential damage.

  Symptoms: No warning. Belt failure leads to total damage with bent valves.
  500–850 $
  Ad timing belt D5244T4timing beltsatz Volvo D5 185PSwater pump D5244T4

+ 2 more engine weaknesses + vehicle weaknesses

D5 with two-stage sequential turbocharging for 151 kW and immediate response from low RPM. Small turbo for responsiveness, large turbo for high-load work. Complex to maintain due to the two-stage turbo system.

• !! Injector seal leaking from 140,000 km

  On the later D5244T10, injector copper seals can also leak. The two-stage turbocharging system increases cylinder pressure, placing greater stress on sealing surfaces.

  Symptoms: Black deposits around injectors, fuel smell, misfires, rough engine running.
  300–1,500 $
  Ad fuel injector gasket D5244T10fuel injectorn-Kupferdichtring Volvo D5 205PS
• !! Swirl flap linkage breaks from 150,000 km

  The intake manifold swirl flap on the D5244T10 carries the same design problem as in the T4. The plastic linkage fatigues and breaks; loose parts can cause engine damage.

  Symptoms: Check engine light, rattling intake noise, power loss, possible engine damage on complete failure.
  200–4,000 $
  Ad swirl flap D5244T10Drallklappe Volvo D5 205PSintake manifold D5244T10
• !! Timing belt + water pump from 160,000 km

  Replacement interval 160,000 km or 10 years. On the two-stage turbo diesel, engine damage from belt failure is even more costly — so maintenance must not be skipped.

  Symptoms: No warning signal. Belt failure leads to immediate engine damage.
  500–850 $
  Ad timing belt D5244T10water pump D5244T10 Volvo

+ 1 more engine weaknesses + vehicle weaknesses

Upgraded version of the five-cylinder naturally-aspirated engine with 125 kW and intake VVT. Same robust chain drive construction as the B5244S, but with more power from a revised intake system. Well suited to relaxed long-distance driving.

• !! Timing belt replacement mandatory from 160,000 km

  The timing belt also drives the water pump. Belt failure or skipping causes immediate engine damage. Replacement interval 160,000 km or 10 years including water pump.

  Symptoms: No warning before belt breaks. Sudden stall or loud rattling signals damage.
  450–750 $
  Ad timing beltsatz B5244S2Volvo timing beltsatz 2.4
• !! PCV oil separator clogged from 120,000 km

  The plastic PCV oil separator housing becomes brittle and clogs internally with sludge. Elevated crankcase pressure forces oil past seals — typical Volvo five-cylinder problem.

  Symptoms: Rough idle, whistling noise, oil mist from breather hoses, oil spots under the vehicle.
  150–500 $
  Ad Volvo PCV oil trap 2.4crankcase ventilation B5244S2
• !! Water pump and radiator susceptible at higher mileage from 150,000 km

  The B5244S2 naturally-aspirated engine shows cooling system weaknesses at high mileage: water pump and radiator can leak or fail. Water pump is part of the timing belt service kit; replace radiator immediately on any leak.

  Symptoms: Coolant loss, engine temperature rises in city traffic, slight streaking visible on radiator.
  300–900 $
  Ad water pump B5244S2radiator Volvo 2.4 S60 V70

+ 1 more engine weaknesses + vehicle weaknesses

Turbocharged five-cylinder with 2.5 litres and 154 kW, manufactured in Skövde, Sweden. Mitsubishi turbocharger with intercooling for strong mid-range torque. Chain drive; popular as a harmonious all-round engine without extreme peaks.

• !! Timing belt + water pump mandatory from 160,000 km

  Replacement interval 160,000 km or 10 years. Timing belt drives water pump. An old pump failing after a belt change can instantly destroy the new belt.

  Symptoms: No warning signal. Missed service causes engine damage without warning.
  550–950 $
  Ad timing belt B5254T2water pump Volvo 2.5T
• !! PCV oil separator clogged from 100,000 km

  Plastic PCV system hoses become brittle and crack, separator clogs with sludge. Crankcase vacuum draws oil past camshaft and crankshaft seals.

  Symptoms: Whistling noise from under bonnet, oil spots on underbody at rear of engine, rising oil consumption, smoke from engine bay.
  150–500 $
  Ad PCV oil trap B5254T2Volvo 30650233flame trap 2.5T Volvo
• !! Turbo drain pipe seal leaking from 150,000 km

  The turbocharger oil drain line seals with O-rings that stretch at higher mileage. Oil loss at the turbo housing and increased oil consumption follow.

  Symptoms: Blue smoke after coasting, oil accumulation under the vehicle near the turbo, oil consumption 0.5–1 L per 1,000 km.
  300–1,000 $
  Ad Turbo-Ölrücklaufleitung gasket B5254T2Volvo turbo oil return Leitungturbocharger seal kit 2.5T

+ 1 more engine weaknesses + vehicle weaknesses

Evolved 2.9-litre T6 six-cylinder with improved turbocharging. 203 kW from an elegant inline-six for Volvo's flagship range. Chain drive, but complex intake geometry; specialist workshop maintenance recommended.

• !! Gearbox overloaded by torque from 120,000 km

  The GM automatic gearbox used in the XC90 T6 was not originally designed for the full torque of the B6294T. Gearbox failures on early 2003–2005 models are documented.

  Symptoms: Shifting problems, gearbox slips, gear selection refused, gearbox oil leak, harsh jerking when changing gear.
  2,000–6,000 $
  Ad XC90 T6 gearboxAW55 transmission B6294TVolvo XC90 T6 gearbox
• !! Timing belt + camshaft adjusters from 100,000 km

  Camshaft adjusters frequently leak oil. Timing belt should be changed every 100,000 km. A break causes costly valve damage. Combination of a leaking adjuster and an old belt is common.

  Symptoms: Oil patch at top of engine, camshaft fault code, rough engine running, check engine light.
  600–2,000 $
  Ad timing belt B6294Tcam phaser B6294T XC90timing belt Volvo T6 2.9
• !! Water pump bearing fails prematurely from 150,000 km

  The B6294T water pump is driven via an auxiliary drive shared with the power steering pump. The bearing can fail at high mileage, causing coolant loss. Repair time approximately 3 labour hours.

  Symptoms: Squealing or grinding from engine block, coolant loss, rising engine temperature
  400–1,200 $
  Ad water pump B6294Twater pump Volvo 2.9 T6 S80 XC90coolant pump Volvo B6294T

+ 3 more engine weaknesses + vehicle weaknesses

Naturally-aspirated short inline-six with 3.2 litres, 175 kW, and smooth running. Developed for Volvo flagship models as a refined alternative to the turbocharged engine. Chain drive with known chain tensioner weaknesses at higher mileages.

• !! READ unit (thrust bearing) fails from 130,000 km

  The READ (Rear Engine Auxiliary Drive) on early B6324S engines uses needle bearings instead of ball bearings. These bearings can seize with inadequate lubrication. Switched to ball bearings from 2011 (B6324S5).

  Symptoms: Loud rattling or grinding from the rear of the engine, oil pressure loss, MIL light, engine noise under load.
  800–3,000 $
  Ad READ-Einheit B6324SVolvo 3.2 rear aux driveneedle Lager B6324S
• !! READ unit bearing failure (up to 2010) from 120,000 km

  Before MY2011, the READ unit (Rear Engine Ancillary Drive) uses needle roller bearings that can fail prematurely under splash lubrication. Typical symptom: squealing/grinding from the engine bay. Complex removal with special tooling required.

  Symptoms: Grinding or rumbling from the right-hand side of the engine bay, especially on cold start; progressively louder
  800–2,500 $
  Ad READ-Einheit Lager B6324SRear Engine Ancillary Drive Volvo 3.2
• !! Camshaft end plugs leaking from 100,000 km

  Technical service bulletins document oil leaks at the B6324S camshaft end plugs. Oil seeps from the side of the cylinder head. Volvo has issued a repair procedure.

  Symptoms: Oil leak at the side of the cylinder head, oil smell after driving, engine oil loss with no visible underbody source.
  200–800 $
  Ad camshaft end plug B6324Scamshaftndeckel Volvo 3.2Volvo TNN21-28

+ 4 more engine weaknesses + vehicle weaknesses

Evolved 3.2-litre naturally-aspirated engine with reduced internal friction and 179 kW. Improved crankshaft bearing and revised thermal management. Manufactured at the Ford plant in Wales; check chain tensioner above 150,000 km.

• !! Camshaft end plugs leaking from 100,000 km

  B6324S5 camshaft end plugs can leak oil — same TSB issue as the predecessor. Volvo has issued a repair procedure (TNN21-28).

  Symptoms: Oil seeping from the side of the cylinder head, oil smell after driving, gradual oil loss.
  200–800 $
  Ad camshaft end plug B6324S5camshaftndeckel Volvo 3.2 2011+
• !! PCV diaphragm valve fails — oil sucked into intake from 100,000 km

  The B6324S5 uses a diaphragm for PCV regulation. When the diaphragm fails, full intake vacuum acts on the crankcase: oil is actively drawn into the intake tract. A functioning PCV system shows slight negative pressure at idle.

  Symptoms: Oil consumption with no visible leaks, oil in air filter element, rough idle, whistling noise.
  200–700 $
  Ad PCV diaphragm B6324S5crankcase ventilation Volvo 3.2 XC90
• ! Slight to moderate oil consumption from 150,000 km

  Even the revised B6324S5 shows slight to moderate oil consumption at higher mileages. Up to 0.5 L per 1,000 km is internally tolerated by Volvo, but should be monitored.

  Symptoms: Oil level visibly drops between oil changes, no smoke or leaks detectable.
  100–3,000 $
  Ad piston ring set B6324S5valve stem seals Volvo 3.2

+ 1 more engine weaknesses + vehicle weaknesses

Yamaha-developed aluminium V8 with 4.4 litres and 232 kW for Volvo's flagship models. First V8 to meet the ULEV-II standard; six-speed Aisin automatic with Haldex all-wheel drive. Refined running but complex to maintain; specific oil care required.

• !! Balance shaft bearing fails (critical) from 100,000 km

  On early engines up to engine number 6833, water collects in a recess in the engine block and destroys the balance shaft bearing. The bearing seizes, the shaft flails against the block, and the timing chain jumps. Catastrophic engine damage.

  Symptoms: Loud metallic clattering or banging from lower engine, power loss, engine oil pressure drop, stop immediately.
  3,000–15,000 $
  Ad Ausgleichswellen-Lager B8444SVolvo V8 4.4 AusgleichswellenlagerAusgleichswelle XC90 V8
• !! Timing chain wears due to balance shaft failure from 100,000 km

  When the balance shaft bearing fails, the shaft strikes the engine block and pulls the timing chain out of synchronisation. Valves are bent and total engine damage follows.

  Symptoms: Rattling noise on start, check engine light with crankshaft/camshaft fault, engine shudder, power loss.
  2,000–12,000 $
  Ad timing chain kit B8444Stiming chain Volvo V8 4.4timing chain V8 XC90
• !! Water pump and cooling system from 130,000 km

  V8 water pump can fail. On an eight-cylinder engine with high heat output, overheating is especially damaging. Check coolant level and quality regularly.

  Symptoms: Coolant temperature rises, coolant loss, heater delivers cold air, overheating warning.
  500–2,000 $
  Ad water pump B8444SVolvo V8 XC90 water pumpcoolant pump 4.4 V8

+ 1 more engine weaknesses + vehicle weaknesses