Less than half the noise of 2017, but the eight-speed is still in the file — a late-build 2018 is the one to want.

Unique to this model year. Toyota recalled 2018 Siennas built with a specific lot of ten-spoke alloy wheels from one production facility: 'these wheels may not have been properly cooled during manufacturing. As a result, the wheels may crack in the spokes from an impact while driving,' and a cracked wheel can separate from the hub. Dealers inspect and replace as needed, free; Toyota's internal code is J0J and it began notifying owners by telephone in February 2018. Because the remedy depends on where the wheel was made, a van can pass inspection and keep its original wheels — so confirm what was actually done, not just that the recall closed.

Power sliding doors fail four ways on this generation: the cable that pulls the door snaps and hangs down above the rear tyre; the centre hinge corrodes so the door jams just as it closes; and the front or rear lock assembly seizes so the door will not latch. Toyota's class-action settlement produced a Customer Confidence Program under code ZKI, plus two Warranty Enhancement Programs — ZH4 for the front lock assemblies, ZH5 for the rear — and Toyota's own bulletin states the terms: the cable sub-assembly, centre hinge and fuel-filler door are covered for '10 years from the subject vehicle's date of first use, regardless of mileage', while ZH4 and ZH5 run nine years from first use plus one more, also with no mileage cap. 2018 is the newest model year those programs reach. Two cautions from the federal file: one 2018 owner reports a broken door cable and being told it was 'not covered on current service bulletin POL19-02 dated 06/19/2019', which is a reminder that the programs are scoped by VIN and by part, not just by year; and a long-term owner of a comparable van had the latches replaced at around 50,000 miles and saw the fault return by 85,000.

The 2018 Sienna is covered by both the original low-pressure fuel-pump recall, 20V-012, and its expansion, 20V-682, which explicitly names 2017–2020 Sienna (Toyota code 20TA02). The pump inside the fuel tank can fail, and Toyota's own summary is direct: 'if the fuel pump fails, the engine can stall while driving.' Dealers fit an improved pump free. A federal court then approved a settlement on 20 December 2022 obliging Toyota to run a Customer Support Program for certain 2014–2020 vehicles whose pumps were repaired under this recall — its terms are not stated in the bulletin summary, so verify them in the bulletin PDF. That program matters here because 2018 owners in the federal file report hesitation and stalling continuing after the recall repair, plus one fuel line under the intake that ruptured on startup.

The 2018 uses the updated 3.5-litre V6 with direct injection — fuel sprayed straight into the cylinder rather than into the intake — internally the 2GR-FKS. Toyota has two bulletins about it leaking oil: one for a leak from the camshaft-sensor bolt holes on 2017–2018 Sienna and Highlander, and one for a leak from the No. 2 oil pan on 2017–2020 Sienna, narrowed in a later revision to engines whose serial number begins with F or G. Toyota listed the oil-pan leak as 'currently under investigation' and asked technicians to photograph it before repair, which means the root cause was still open when the bulletin issued. Our mechanic source adds that the water pump on this engine still leaks despite an updated part — 'I've replaced a bunch of them already on 17, 18, 19s.' Have it on a lift and look for oil and coolant before you buy.

Front struts leaking is close to a maintenance item on this van according to our mechanic source, and he names the cause: water off the windscreen collects in the cowl and sits on top of the strut mount, rotting it. He also flags front lower control-arm bushings wearing fast, testable by braking hard at low speed with a light hand on the wheel — a sharp jump to one side is the tell. On infotainment, Toyota has four separate bulletins covering the Entune 3.0 system on 2018–2020 vans: apps failing to download, Bluetooth not connecting automatically, and reboots. Our mechanic source is resigned about it: 'radio problems… rebooting, freezing up, to flat out radio doesn't even start.' Also in this year's federal file: a sunroof that shattered at 70 mph, water running into the cabin and pooling on the front seats, and Safety Connect failures. Three of the seven recalls are mobility-conversion recalls belonging to Braun and Vantage, applicable only to wheelchair-converted vans.