Volvo S90 D5 AWD SPA

Volvo recalled over 500,000 vehicles globally (approximately 70,000 in the UK alone) fitted with the 2.0-litre four-cylinder diesel engine produced between 2014 and 2019. The plastic intake manifold can melt and deform due to heat, and in extreme cases this can lead to a localised engine bay fire. Early symptoms include an abnormal smell, engine interruption, loss of power, and illumination of the engine warning light. The recall is free of charge at Volvo dealers. Before purchasing any S90 D5, it is essential to verify with Volvo using the VIN that this recall has been completed. If the work has not been done, insist it is completed before purchase.

The D5 engine features Volvo's PowerPulse system, which uses a small compressor and air reservoir to inject compressed air into the exhaust manifold at low revs, spinning up the turbos to eliminate lag. The rubber hose connecting the compressor to the reservoir is a known weak point that commonly bursts, particularly at the upper connector. Forum owners describe the original hose as barely better than a garden hose for what is a pressurised system. When the hose bursts, the compressor runs continuously trying to maintain pressure (it has a thermal cutoff at 125 degrees Celsius to prevent overheating). Symptoms include a hissing noise from the engine bay and a slight increase in turbo lag from standstill. Volvo has issued an updated replacement hose. The repair itself costs approximately 150-400 euros depending on the workshop. Many owners had this fixed under warranty. The car remains safe to drive if the hose bursts.

The D4204T23 engine uses a compound twin-turbo system with both a low-pressure and high-pressure turbocharger. While generally robust, turbo failure has been reported, particularly on cars with irregular oil changes or high mileage. Symptoms include progressive power loss, blue or white exhaust smoke under load, excessive oil in the intercooler piping, and diagnostic codes P0299 (underboost) or P2262. Because the two turbos are integrated into a single assembly, both must be replaced together. A dealer quote for full turbo replacement including calibration can reach 4,000-5,000 euros. Specialist workshops offer the same repair for 2,500-3,500 euros using aftermarket or remanufactured units. Preventive measures include regular oil changes with quality synthetic oil every 15,000 km and avoiding immediate engine shutdown after sustained high-speed driving.

The EGR valve on the VEA diesel engine is susceptible to carbon buildup, particularly on cars that do predominantly urban or short-trip driving. Symptoms include rough idle, poor starting, loss of power, check engine light, and in advanced cases, limp mode. The cracked EGR pipe is a related failure point that was sometimes covered by Volvo goodwill. Cleaning the EGR valve at a specialist costs approximately 200-350 euros and can restore function if no physical damage exists. Full EGR valve replacement costs 400-1,000 euros depending on the workshop, with Volvo dealers quoting towards the upper end (one UK owner reported over 900 pounds at a dealer). The issue typically becomes noticeable between 80,000 and 150,000 km. Frequent motorway driving helps prevent carbon buildup.

The DPF requires regular regeneration cycles, which need sustained driving at motorway speeds (at least 20-30 minutes at higher revs) to burn off accumulated soot. Cars used primarily for short urban trips never reach the temperatures needed for passive regeneration. When the DPF becomes too full, the car will attempt a forced active regeneration, but repeated failures can lead to a permanently clogged DPF. A clogged DPF triggers warning lights, power reduction, and eventually limp mode. Professional DPF cleaning costs 300-500 euros. If the filter is too damaged for cleaning, a replacement DPF runs 1,500-2,500 euros including fitting. The DPF pressure sensor (approximately 150-250 euros to replace) can also fail and cause incorrect regeneration timing.

The S90 D5 uses an SCR (Selective Catalytic Reduction) system with AdBlue injection to meet Euro 6 emissions standards. Common failure points include NOx sensor malfunction, AdBlue dosing pump blockage, and the tank output valve. When the system detects a fault, it displays a warning message and starts a countdown: after a set distance, engine restarts will be blocked until the fault is repaired. One V90 owner reported the AdBlue tank output failing, requiring a pump replacement at approximately 1,600 euros. NOx sensor replacement costs 300-500 euros. AdBlue pump repair or replacement runs 500-800 euros. These issues are more common in very cold climates (AdBlue can crystallise) and on cars that sit unused for extended periods.

The Sensus infotainment system on the SPA platform is a widely reported source of frustration. The centre display can freeze, go blank, or spontaneously reboot during driving, temporarily disabling climate control, navigation, media, and parking sensor audio. Most cases are resolved with a software update at the dealer (free if under warranty, approximately 100-150 euros out of warranty for diagnostics and update). A hard reset by holding the home button for 20-30 seconds resolves most temporary freezes. In rare cases, the entire display module fails and requires replacement at 800-1,200 euros. Volvo has released multiple software updates to address stability. Ensuring the car has the latest software version before purchase is recommended.

The S90 D5 AWD uses a BorgWarner/Haldex 5 multi-plate clutch coupling to engage the rear wheels. Despite Volvo not including it in the standard service schedule, the coupling fluid and filter should be changed every 60,000-80,000 km. If neglected, the filter screen clogs and the pump has to work harder until it burns out, resulting in loss of AWD function, front wheel spin in slippery conditions, and error codes. Pump replacement costs approximately 250-350 euros for the part alone, plus 2-3 hours labor. If the coupling clutch pack itself is damaged from debris in old fluid, the complete unit must be replaced at 1,000-1,500 euros. Preventive fluid and filter changes cost approximately 150-250 euros and are excellent insurance.