RS Q8 vs Bentayga

The RS Q8 was introduced as a 2020 model (no 2019 model exists), and the 2020-2021 variants with the 4.0T V8 are covered by NHTSA recall 21V244 for a fuel rail fitting that can loosen and leak fuel, creating a fire risk. Symptoms include a gasoline smell or visible fuel puddle. The recall repair is free; independent out-of-pocket repair is about $1,150 including parts and labor.

The RS Q8's rear driveline can develop excess backlash or dry splines, producing a loud metallic clunk or pop when shifting from Park to Reverse/Drive or under low-speed throttle changes. It can cause premature wear of driveshaft or differential flanges if ignored. Greasing the splines under a TSB typically costs around $300; if flange/driveshaft replacement is needed, expect $1,200 to $2,500.

The air suspension struts and compressor can leak from rubber bellows or O-rings, causing the vehicle to sit lower after sitting and the compressor to run constantly with a 'Suspension: Malfunction' message. If left unrepaired, the compressor can overheat and fail, leaving the car stuck on its bump stops. Replacing a strut is about $2,150 and compressor replacement is around $1,100 to $2,000, with full four-corner replacement exceeding $5,000.

The 48V battery or belt-driven starter/generator can fail, triggering a 'Start/Stop system unavailable' warning, check engine light with code P0A16, or loss of electrical power assistance and possible engine stall/limp mode. Replacing the BSG is about $2,150 including labor; the 48V lithium battery itself is $2,500 to $4,000 in parts. Ignoring it can leave the vehicle shut down while driving.

The MIB 3 infotainment system can freeze, go black, or reboot randomly while driving, and may drop Bluetooth/navigation or prevent the rear-view camera from engaging. Audi's software updates can reduce the problem but do not always fix hardware faults. A software update costs about $250 at an indie shop, while replacing the MMI control unit is $1,200 to $2,500.

The 4.0T V8's PCV/oil separator can fail, causing blue/white exhaust smoke, low oil pressure warnings, and oil consumption around one liter every 750 miles. If ignored, fouled spark plugs and severe carbon buildup can lead to expensive engine damage. Replacing the PCV/oil separator and valve cover assemblies is about $1,150; a damaged engine may require an $8,000 to $15,000 rebuild.

Affected 2019-2023 Bentaygas, including V8, W12, and Hybrid variants, can drop to the lowest ride height, show a suspension fault warning, and suffer compressor or strut failure. A leaking strut can tear the rubber bellows and make the vehicle repeatedly re-level while parked, eventually immobilizing it. A full strut replacement is approximately $3,250 per corner at an independent specialist, while compressor replacement separately runs about $1,200-$2,500.

Bentaygas from 2019-2024 with the optional Dynamic Ride system can develop 48V actuator faults or seal failures that trigger a chassis system fault and noticeably increase body roll. Driving remains possible, but the active anti-roll function is disabled and a failed unit can eventually lead to a no-start if the 48V network is affected. Replacing one 48V actuator at a specialist typically costs around $4,500, with dealer work often exceeding $8,000-$12,000 when related modules are included.

Many 2019-2025 Bentaygas, especially Hybrid and V8 models, suffer parasitic 12V battery drain from telematics and standby electronics, often leaving the car dead after 5-14 days of sitting. Symptoms include low battery warnings, erratic infotainment behavior, and intermittent keyless-entry failure. A specialist battery replacement is roughly $800 including parts and labor, with dealer service and parasitic-draw diagnosis easily exceeding $1,000.

Pre-facelift 2019-2022 Bentaygas commonly experience MMI freezes, black screens, Bluetooth disconnects, and random reboots, with the 2021+ system also showing occasional reboots. Because climate and vehicle settings share the display, a failure also removes control of those functions. A replacement head unit from a specialist costs roughly $2,000-$4,500, while dealer new-unit replacement with labor and coding typically runs $5,000 or more.

Bentley issued recalls for fuel-line routing on 2019-2020 V8 models, oil-separator/PCV failures on V8 engines, and W12 coolant-pump leaks; recall repairs are free. Outside recall coverage, V8 oil-separator replacement costs about $2,000 at a specialist and a W12 coolant-pump replacement can run roughly $3,000-$5,000. Symptoms include fuel smell or visible leak, excessive oil consumption with blue smoke, and coolant loss with potential overheating.

The 2019-2021 Bentayga can have low-speed ZF 8HP jerking, delayed downshifts, and harsh 1-2 or 3-2 shifts, mostly due to TCU calibration rather than hardware failure. A dealer transmission-software update is usually covered under warranty or costs about $500 out of pocket; genuine mechatronic failure is less common and can require a $5,000-$9,000 replacement. Rare cases may trigger a transmission warning and limp-home mode.