Three-cylinder petrol carbon build-up and oil consumption
- Typically appears
- 50,000+ miles
- What to inspect
- Check oil level and test acceleration under load

A premium compact SUV with strong demand across petrol, hybrid and electric versions.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed August 2026
The most commonly reported faults on the 2018–2025 Volvo XC40 are PHEV and EV battery health and charging faults, Panoramic sunroof drain tubes block or detach, leading to severe water ingress into the front footwells and potential Central Electronic Module (CEM) damage and Three-cylinder petrol carbon build-up and oil consumption. 2 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
Turn these known faults into a step-by-step viewing plan for this exact Volvo XC40 · $9.
Build the inspection planBased on the documented faults on this page for the Volvo XC40.
Guidance only · reflects reported patterns, not a specific car's condition.
Three-cylinder petrol carbon build-up and oil consumption
Sensus infotainment freezing and software faults
Turn these known faults into a step-by-step viewing plan for this exact Volvo XC40 · $9.
Build the inspection planPHEV and EV battery health and charging faults
Rear disc corrosion on hybrid and electric versions
Fuel filler flap locking actuator seizes, leaving the flap permanently locked or failing to latch closed.
Front suspension top mount bearings wear prematurely, causing a distinct knocking or spring-binding noise during low-speed steering.
Panoramic sunroof drain tubes block or detach, leading to severe water ingress into the front footwells and potential Central Electronic Module (CEM) damage.
Eight-speed Aisin automatic transmission exhibits harsh downshifts or a noticeable jolt when engaging drive or reverse, often due to degraded fluid or worn torque rod mounts.
Build a tickable plan for the viewing · where to look, what a bad result means and what to ask the seller. One-off price $9.
Build my inspection planSafety reputation, design and a premium interior at a price that competes with mainstream SUVs.
Battery health, charging cables and the real-world electric range achieved.
R-Design and Inscription with the larger screen and driver assistance pack.
Early D3 and D4 diesels from 2018 to 2020 offer excellent towing capacity but are less desirable in urban areas despite being Euro 6 compliant. They suffer from typical DPF and EGR clogging if used strictly for short trips. Only stock these with full service histories for rural customer bases.
Volvo transitioned the XC40 from the older Sensus system to the Android-based Google Automotive OS for the 2023 model year, which includes late 2022 builds. You can identify the Google system instantly on the forecourt by checking for Google Maps as the native navigation and the Google Assistant voice icon.
The 2.0-litre four-cylinder petrol engines, including T4, T5, and later B-series mild hybrids, utilise a timing belt rather than a chain. The manufacturer schedule dictates replacement at 150,000 miles or 10 years. However, many UK specialists recommend replacing the belt and tensioners at 100,000 miles or 8 years preventatively.
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.
Buying a Volvo XC40? Build a step-by-step viewing plan for this exact car · $9.
Build the plan