Sorry to hear of your IS220D woes.
I bought a 2006 IS220D 5 years ago on a whim thinking better MPG and reliable. Never failed an MOT or any advisories and serviced yearly. Had 172,000 miles and was clean.
Paid £1,475 for it on Ebay.
Fitted a full size spare alloy by cutting out the boot tray. New AC condenser so ice cold AC. New Avon 7V7 tyres all round 2 months prior to scrapping it!
On collection drove fine and no HG failure. Lasted 19 months before coolant pressurising and coming out the vent pipe overflow and down the rad/fan.
Gradually got worse and scrapped it for £350.
Mine was a basic SE trim. loved the build quality, safety kit and the colour. Mismatched gearbox and turbo lag I didn't like.
Prior and still drive the old rear wheel drive Volvo 740, 240 and since 2016 a 1996 Volvo 940 SE LPT, petrol auto estate. Paid £250 then and still going strong at 211,000 miles.
Should of bought a IS250
Soon after bought a Toyota Auris Hybrid TS. Cheap to run and does it's job.
Photo of it on day of collection for scrap. Said they scrapped 4 a week. Injectors keeping, cut off the cat, wheels and tyres as looked really good. Body panels no demand!
James.