ColinBarber

I think you are being overly harsh there, grey isn't that bad. You should be able to get at least £1k.

Wow, must make the blue ones worth £100k 😉

Not worth it IMO. As others have said it doesn't really make a difference to the sound if keeping the stock airbox. Most people over oil them and cause issues with the MAF. You don't really need the extra air that the filter can pass if you aren't doing other mods to make use of it because the stock system isn't causing a restriction. The better breathing comes at the cost of less filtering which increases engine wear (although very minor). Back in the 1980s when you are changing the filter every 10k miles then there could be a cost saving, now when the OEM filter only requires changing every 40k miles that advantage isn't there.

Seems to being blown out of proportion that this is a Toyota hybrid issue. The AA/RAC etc are receiving plenty of calls due to flat batteries but they certainly aren't restricted to Toyota/Lexus vehicles. Plenty of MB/BMW owners complaining of their vehicles not lasting more than 3 weeks etc. Toyota's recommendation of using/sitting in a vehicle once a week for an hour isn't restricted to hybrid owners. If you were to leave any vehicle for 5 weeks you would be shortening the life of a lead-acid battery, they just aren't designed for that. Toyota have been designing hybrid vehicles for 20 years. They have had plenty of time to understand if the size of the aux battery is a problem for owners - I'm guessing they feel they have the balance right, and the batteries of the Prius for example have certainly increased over the years, probably due to extra electronics in vehicles over that period and systems such as smart entry that continue to use power when the vehicle is unused.

Yes that's a good point. I think there are a couple of electrical connectors and wiring close to the thermostat - and I think one of them is the crank sensor which would certainly stop the engine from firing if that were disconnected.

Agreed. I think I've only done around 300 miles in my vehicle since April and I leave it permanently connected to a trickle charger. But I guess not everyone has the convenience of electrical power near the vehicle. But I think I'd rather run an extension lead to my vehicle and use a charger once a week for a few hours rather than starting up the vehicle and sitting in it for an hour.

It's probably 2k over what I've seen similar vehicles go for somewhat recently.

There aren't many with the sunroof option. Most GS Fs were purchased by Toyota as press cars or employee vehicles. Nearly all these had ML and no sunroof. I guess some of the dealers purchased demo/stock vehicles and I don't know the spec of those but only a handful were purchased new by the public, and anyone who wanted to track their vehicle would deem a sunroof as undesirable.

I don't think it has one - not according to this parts catalogue: https://lexus.7zap.com/en/eu/lexus+gs/334510/gws191r-bexqhw/1/1106/114126a/#11328 and the repair manual for a 2012 GS450h (same engine) shows the use of a sealant rather than gasket at step 40: http://zatonevkredit(blocked word)/repair_manuals/raw_content/AWIxsx8YU9h2CeTmchFc

Most people don't need the one the OP purchased. A smaller one would be sufficient https://www.halfords.com/motoring/battery-maintenance/jump-starters/gb40-1000a-noco-jump-starter-721898.html

Take a look at RockAuto for some options: https://www.rockauto.com/en/catalog/lexus,2008,gs450h,3.5l+v6+electric/gas,1441480,engine,timing+set,5756 You would have to research the companies about quality as I'm not familiar with them.

Not sure on that specific device but if it is ODB compliant and supports IS0 9141/14230 protocol it should work as I believe all UK IS200s are ODB compliant - unlike some of the Altezza imports and also the UK Lexus GS300 wasn't until 2001.

The OP has a hybrid vehicle, no current is used from the 12v battery to start the vehicle.

I've a Genius 5 I use for charging, but I keep my car connected to a Genius 1 to keep it fully charged - cheaper option. https://www.halfords.com/motoring/battery-maintenance/battery-chargers/noco-genius1-1-amp-battery-charger-230262.html

They don't provide nearly enough power. The 2.4w quoted would be at midday in the summer with the panel directly aligned to the sun. Sitting on a dashboard with glass in the way, only directly aligned to the sun for an hour or so every day (if any due to cloud), and with the amount of daylight hours during our winter months it would probably slow the discharge to give you an extra a couple of days at best. It certainly wouldn't be able to maintain the battery at a fully charged state. You also need one that attaches to the ODB port as the 12v socket isn't permanently live.

Not sure there is an hour's reading material in that last option 😉

Sometimes you get what you pay for. A cheap no name Chinese company selling a poorly designed product under multiple different brands on Ebay and Amazon in which you may be lucky and get ones that works, or purchase a product from a large company that has an image to uphold and conforms to all the required safety standards across the world and provides owner support.

Plugs are Denso FK20HBR8. Opie do them for £13.50 each. https://www.opieoils.co.uk/p-206755-denso-super-ignition-spark-plug-fk20hbr8-3491.aspx or £14.33 from a Lexus dealer: https://lexuspartsdirect.co.uk/parts/lexus-is/lexus-is-phase-iii-2013-present/lexus-is-3-engine-service-kits/lexus-is-phase-3-spark-plugs-2-5l-petrol-hybrid/

Too early to say whether this is expected life due to mileage, expected life due to age or just unlucky. It's the first IS300h I've heard of having this issue, and I suspect hybridbatterysolutions haven't seen many, if at all, yet. Whilst the hybrid batteries between all Toyota/Lexus vehicles is very similar, certain battery pack designs can lead to less reliability but in theory the 300k+ miles seen with Prius vehicles should be possible with the IS.

The LC500h and the LS500h in the UK use Lithium-Ion traction batteries. The ES worldwide was using a NiMH one but Japan started using Li-ion sometime last year and the MY21 models built in the US also now do, but it seems not the European ones which is a shame as the boot space is bigger and it does slightly improve mpg. I suspect all the red tape of getting the new model type approved for Europe wasn't worth it, and the price increase might has nudged it over tax thresholds.

Security light should continue to flash until the key is in the barrel. This indicates the immobiliser is active until the key is brought in close proximity to the sensor which is right next to the barrel. The fact that the light stops flashing indicates the immobiliser is being disabled and therefore isn't the cause of the engine not firing. I would check all the fuses in the engine bay, including the large high amp ones - I've known some to blow when people change the battery, especially if the battery was accidentally connected the wrong way round (which normally blows the 120A fuse module and is a pain to replace (bolted in from the underside of the fusebox)).

What Lexus website are you referring to? I don't believe there is any reference on the European websites (including the UK) as to my knowledge all vehicles built for Europe are continuing to use NiMH batteries. If you have the chassis number I can confirm.

Forgot

17 psi is correct.

60k on all current models I believe. It is only based on mileage though, not 60k/6 years (whichever occurs first) so if you don't do 10k miles a year they don't need to be changed on the 6th service.