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My dealer has advised this is most likely to be the brake accumulator and is normal for it to be running all the time. Strange that I've never noticed it running continuously in the past but explains why you've not had any problems with yours @Upex.

Thanks for the reply, I've had my car for well over a decade now (still love it), got to know all the noises pretty well and though this wasn't an unusual noise, the constant running when in electric mode was new. At least I might not have to rush to get it checked, I'd still like to know why it's changed but might wait now till the next service later this year. Glad to hear you're still running and enjoying yours!

Hi, not sure if you still have your GS or can recall but I think I have the same issue, in fact it's only recently occurred after just having my brake discs all round and 2 calipers changed. Did you ever get to the bottom of it and find a solution? Thanks in advance, Pravin

Yes I'm happy I stayed with OEM, glad you got it sorted in the end.

By the time you add the fitting and tips to the Lexus Bristol price that's over double what your going to be paying, well worth the shop around that one.

Agreed, we are 'fortunate', that is a particularly unwelcome bill for an exhaust.

Personally, I just wanted to keep the car as quiet as possible, this replacement should see me out with the car so not too concerned by the warranty side. Appreciate the suggestion and I have done s/s on an old Honda CRX Vtec I used to have (loved that car) but it did make it a little noisier despite best efforts..

That's the best price I've seen for a genuine back box so well done there, possibly Lexus Bristol were pricing for new tips too?

I had the back box section replaced. Starts off as a single pipe which connects to main exhaust then splits in a Y piece to feed each of the new silencers, it's all one assembly. The original tips were re-used and the £650 I paid was fully fitted inc. vat.

Thanks for the objective point of view, I was beginning to feel I was expecting too much from it. 10 years is a good life for a quality system and though the bulk of the mileage the car has done is c80+ miles of commute when it is in use the corrosion does appear to have eaten away from the inside so there must have been enough short trips to take their toll. Thanks again for all your helpful advice and information.

Do you think I'm being unreasonable in expecting better from a Lexus?

My exhaust had infact snapped away at a different point than expected, it was right at the entry to the rear silencer on the driver's side. There is actually a metal cradle of sorts which sits right beneath this point on both silencers, I'm not sure what they are for but you can see that is what hit the road and has been ground down. If it wasn't for that barrier the results may have been more impactful with the potential for the silencer unit to be catapulted upwards and outwards if the edge itself had caught the road at the wrong angle. Total bill was £650 all inc which is near enough what you had paid. The warranty claim was rejected but I am going to pursue with Lexus Customer relations as the warranty is administered by TWG on behalf of Toyota/Lexus. I have grown to like the car considerably over the years and bought into the brand values to the extent that I was only really considering another Lexus as a replacement but dependant upon how Lexus view this I may reconsider. Yes it's a 10 year old car and corrosion is to be expected, indeed if both sides had corroded to similar extents then I would not have bothered mentioning it. But the other side is in much better condition as has useful life still to give so the question would be what is 'normal corrosion / wear & tear' and what is considered abnormal/unusual/accelerated deterioration? I have never had a car do this before, I would have expected more warning signs e.g. a blowing exhaust to indicate is was that badly corroded - even my MOT garage who I trust fully hadn't raised the corrosion they could see as anything of concern.

Quoted £650 for replacement, claim submitted to Lexus warranty but dealer (who I have been very happy with) believes it will go nowhere..

Thanks Messi, will bear that in mind if it comes to considering s/s further as I live in Warwickshire so Walsall is not too far away. Plan 'a' though is to pursue a warranty fix.