Hi folks, I LOVE my RX400h, but I am now dealing with my third water ingress/flooding issue and I am running out of ideas. The first time it flooded, I stripped everything out and did the A-pillar refit/seal. That worked well, and I no longer get water pooling in the front or driver's footwell. The second time it flooded, which happened just after I had fitted a new hybrid battery, the front was completely dry, but the hybrid battery area was flooded. I then discovered that the seams around the rear hatch/boot opening can be a known problem area. I went over those seams thoroughly with sealant and also removed the black rubber strips from the inner roof rack rail running from the fixture point of the back roof rack (about 8-10 cm) to the rear hatch and sealed underneath them. At that point I thought I had covered all the known water ingress points. But the *BLEEP* of a thing has flooded again. I am now at a loss as to where the water is getting in. There are no obvious water stains on the pillars, and I can't see any evidence that it is coming up through missing plastic or rubber plugs underneath the chassis. If anyone here has experienced something similar, or knows of any other common RX400h water entry points I should be checking, I would really appreciate the advice. I've given this car a lot of love, and the previous owner was fastidious with servicing and maintenance at Lexus, so it feels like a huge waste to junk it over a water leak I just can't seem to track down.

Connected App section showing car faults has now been supposedly fixed. They initially stated for months some software issues with Lexus vehicles but it has now disappeared from Connected App. No feedback to say they fixed it - just SILENCE !!!!!

There are many factors that affect fuel economy, such as: excess weight on items stored in the trunk, driving with windows or sunroof open, air conditioning running, infrequent engine oil changes, roof bars, etc. Also, Premium Fuel although more costly actually can increase economy as higher octane

Any owners prepared to share their real world fuel numbers? Mine is a well maintained, apparently fault free engine but I don’t get anywhere near the suggested fuel figures. 80% urban driving, 105000km, 40psi tyres, hardly ever in sport mode. Help!

If you have only just bought it through the dealer then I would return it with a demand for the modification to be carried out immediately or your money back - I'm pretty sure they will jump to it if you reject the car.

I reported a vibration at the reat differential area of my IS300H which my wife and I just bought, only 106 ks travelled, The vibration sounds like and feels, including through the steering wheel like running over a rumble strip at the approach to a railway crossing. I since have found out that this is a common pproblem with the IS300H and Lexus knows about it yet they still neglect to contact me about it, LEXUS CALLS IT REASONANCE AND THEY PRODUCE A FIX FOR IT ACORDING TO A USER IN EITHER UK OR USA. LEXUS MAKE A DAMPER AND WHEN FITTED INCLUDING AN AJUSTMENT TO THE SOFTWARE oON THE COMPUTER ,IT IS FIXED PERFECTLY. WHY WONT LEXUS CONTACT ME AND FIX THIS DAMN PROBLEM AS MOST SPEED LIMITS IN VICTORIA AUSTRALIA CITY AREA ARE 80KS PER HR, SO this vibration continues constantly.

Thanks for your comments, I think I'm going to replace the transfer and diff oil with Valvoine full synthetic 75w-90 and see it it makes a difference, good point about the tyres I've seen a post about tyre noise.

It can reduce the noise but not necessarily lubricate it as it should be - depends if the diff is on the way out and you just want to silence it but keep an eye on the temperature (should feel nominal heat with your hand but if too hot then chances are the diff could fail at the most inconvenient time. You sure its not your tyres that are creating the whining droning noise?