Volvo S90
Drive-E turbocharged four-cylinder with 48-volt mild hybrid system (BISG) for the B3 entry level. The integrated starter-generator on the belt drive provides boost on acceleration and recuperates on deceleration. Up to 15% fuel reduction compared to the conventional petrol engine.
Efficient entry level
B3 MHEV in the S90: quiet, refined saloon with a modest powertrain. The T6 is considerably more entertaining.
Engine Weaknesses 4
The MHEV base engine uses the same timing belt drive as all Drive-E T variants. 120,000 km change interval applies; on the MHEV also check the ISG belt tensioner.
Symptoms: No warning signs; squeaking on cool starts as early warning
All B4204T34 MHEV variants share the Drive-E base engine. The known piston ring and oil consumption problem of the early VEP4 generation also applies here, especially on vehicles prior to the production update in 2019.
Symptoms: Dropping oil level without visible leak, occasional blue smoke, consumption above 0.5 L/1,000 km
The belt-driven 48V integrated starter-generator sits on the accessory belt. At higher mileages the ISG belt and pulley can wear or cause vibration issues. Limited long-term data available.
Symptoms: Vibration on engine rocking, noise on cranking, ISG warning light in instrument cluster
The shared Drive-E base engine of the MHEV variants carries the same PCV weakness. A clogged crankcase ventilation increases oil pressure on seals, promotes oil consumption and can contaminate the ISG with oil.
Symptoms: Oil film in intake area, overpressure at oil cap, elevated oil consumption
Vehicle Weaknesses 10
A faulty weld between the rotor shaft and the hydraulic brake assembly was found on the V90 II and S90 II. If it fails, ABS, ESC and brake assist are disabled. Volvo issued a recall in 2021.
On XC60 II vehicles built between September 2018 and April 2019, nuts and bolts at the rear axle may be too loose. Handling can change abruptly; check recall status.
Plastic intake manifolds on diesel engines up to model year 2018 can overheat and pose a fire risk. Check for Volvo recall; affected models were fitted with metal manifolds.
Water gets into the windscreen wiper motor and causes it to fail. SPA platform models are affected; a 2020 recall addressed incorrectly tightened wiper arms. Visibility in rain significantly impaired.
The air suspension elements on the V90 Cross Country models show wear from as early as 70,000–100,000 km. A warning message and loss of ride comfort announce the failure; repair costs are substantial.
The Sensus infotainment system on the SPA platform (XC60 II, S90 II, V90 II, S60 III, V60 II) freezes or reboots while driving. Software updates improve stability. Steering wheel controls drop out sporadically.
The optional panoramic roof on the V90 II and S90 II shows malfunctions when opening/closing automatically. Faulty sensors or motor controllers can be expensive; water ingress possible if the seal is damaged.
The Sensus infotainment freezes or goes black and does not respond to touch. Smartphone connectivity problems are common; software updates usually help.
Bodywork issues are the most commonly reported weak point by S90 and V90 owners in reliability surveys (8.5%). These usually involve minor paint damage and localised rust spots.
Rear brake pads on the V90 II wear unevenly and generate heavy brake dust. The cause is the electric parking brake and automatic braking functions.