Hi Tony,
Even with a fault, Lexus if they get it in, they will put it in an auction (ie BCA) and they will put a minimum reserve on it of £4500 ... !!! The trade value of your car even with a mechanical fault is not £2500!!! no way!
I will give you an example a 2007 GS450h with 84.000miles is guided at GLASS guide £6,500 trade value. And Black CAP value below avg condition £5,400, average condition £5,950, and clean condition at £6,450.
A retail suggested sale value of £8,450 to £9,050
Now where on earth they ended up offering you £2,500???? I think the dealer is better off convincing you buy a new car from them, they would have a profit of the car you buy, then they would have a massive profit of the car you exchange and the person with the real loss will be you.
I am sorry to hear your story.
I have some problems with my 407 Coupe 2.7 V6 HDi, typical AISIN transmision solenoid failed, but I have decided to order the parts from the states and have a gearbox specialist replace them. (Peugeot wanted £1,500.00 at least for the job).
Same thinking with my GS300 the ABS/Brake pump failed (Lexus wanted 3 times the value of the car for it) ... got a used one. And when I enquired Lexus about the pins on my rear break pads .... (they were very corroded and I wanted them replaced). Lexus in US sells them as rear brake pads fitting kits. When I called Lexus in canterbury to enquire about the part. They said that the pins are not supplied seperatelly and I have to buy the WHOLE caliper! ??? I said are you kidding, shall I give you a part number to type in the system, when I told them I got the part number from a US site, they have gonne on about not being Lexus UK and they will not recognise it. They hung up the phone to me when I asked for their name. The Lexus Canterbury manager would not call me back so I could file a complaint... I then called Customer relations of Lexus and filed a complaint by them, then the canterbury manager called me and the outcome was so what you want us to do...? I gave up.
I think Lexus customer services and support for cars that are outside of any official warranty, they don't want to know...
I still think the best customer service and support I received was with my Mercedes CL500, where the car was 8yrs old and they have done complete both rear quarters replacement painted them, painted the boot, roof, bonnet. Had to take the car in 3 times to get it to my standards ... more less it cost them £9.000!!! and all that was good will gesture!
For £2,500 I would have the car and repair it ;)