Federal Emissions accross the board is 8yrs/80000 miles with the exception of CA.
Like others have said, the reputation of a Lexus Franchise is a high one, not to mention they have the means to accomplish whatever the wish of the customer is before that issue goes viral so to speak.
A friend of mine had his IS-F replaced with 40000 or so miles because of a slight noise in the motor(nothing serious, minor minor valve train noise at idle, couldn't hear it with hood closed). He did not purchase the vehicle new, they replaced his used model with a brand-new one.
This store is no different, they will satisfy YOU, the customer, above all else. Any warranties should have been disclosed at time of sale, upgrades, or 2 day return policies as well. Sounds like this matter is going to go your way. You just have to play a little poker, and take the air out of their ball.

Thanks everyone for the great advice so far!

Just my $.02. I have a Corolla that I bought used back in '03. It was low mileage, but since I have to drive all over the place, I quickly put a few miles on it. I had my CEL come on and give me a P0420 code. That code was a bad cat or O2 sensor. A mechanic friend reset the OBD, but the light kept coming back on with the same code. I did replace one of the two O2 sensors, but the light came back. I searched the Internet on and off for a few years before I found the problem. At the time the CEL first came on, I had hit 90,000 odd miles and my friend told me that the warranty period for the emissions had expired around 85,000 miles and it was going to be pretty hard to get Toyota to replace the cat with the 5,000 or so miles over. I was able to get passed two smog checks, by resetting the OBD and hoping that everything would be in the green, long enough to pass.

The light really started to bother me and I spent another year or two (on and off) searching for the answer. I finally found an obscure reference on a forum that mentioned the MAF sensor, which is nowhere near the cat or O2 sensors and should have thrown a much different code. Well, I started to take the airbox cover off and noticed that two of the clips in an out of the way place had no been latched correctly, allowing air to get around the filter. When I got the MAF sensor out it was coated with grime. After reading how people had had good luck cleaning the sensor with brake cleaner, I decided to do the same. What's the worst that could happen? I kill an already messed up sensor? I cleaned, reinstalled and reset the OBD. It's been a number of years now and the light has NOT come back on! But, in running the car for so long with a dirty sensor and CEL on, the theory is that I destroyed my cat. Two years ago I had to get a smog and nearly passed. It's that time again and even though the light has not come on, I replaced the cat today. The car now has 111,200 miles on it.

YMMV, but maybe it's the MAF sensor that's screwed up....

Good luck!

This is about right.

EDIT: Did a little reading after my post. It's 7yrs./70,000 miles in Cali.

I run into numerous cars which will throw cat and o2 codes......just because the code came back as a bad cat does not mean that there is not an intake/vacuum leak somewhere. Or as mentioned a bad maff sensor...
Live data needs to be looked at and properly diagnosed, I have allot of customers who always return as repeat customers because dealers like to throw parts at cars until its fixed.....
if you take all the tests you can get hired by a dealership...doesn't mean you know how to properly diagnose a problem. I would take the car to an independent, I'm curious to know what the fuel trim levels are doing.

It is a bit frustrating. I thought that those codes are to help diagnose a problem. In my case, I have something on the intake side, throwing an exhaust code. I'm pretty sure I saw a chart that listed most of the codes and there were a lot.

Ah well. I just hope that when I go get a smog in a couple days, that the numbers are a lot better than two years ago.

For the record, the trouble code for the LX-470 was P0430 - Catalyst System Efficiency Below Threshold (Bank 2).

It may be the cat, but...

OBD2 - OBDII Code P0430 LEXUS - Catalyst System Efficiency Below Threshold Bank 2 | Engine-Codes.com

Possible causes
- Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)

The P0420 code is for Catalyst System Efficiency Below Threshold (Bank 1).

Something is obviously wrong.

There you go.......
If its below its threshold its leaning out....meaning unmetered air is getting in after the maff.
A simple” smoke” test will probably reveal the problem.

Yes, I'd be surprised if they did not act quickly to make you a happy customer.

What dealership was this? I am curious and if a client of mine may be able to see if a field engineer has the contact with the most weight to throw around.

I will send you a PM

This is worth a check. In 2007, I bought a 2001 BMW 740iL with the exact same code and it turned out to be a bad MAF. Replaced the MAF and the code never came back.

Update: The Lexus dealer covered the upgrade from the 3rd party warranty (that was already purchased) to the Lexus platinum warranty that covered the replacement of the cats.

So all is good. Thx everyone for your input!

All good. Still illegal. Still unethical.

I would never do business with that stealership again.

They defrauded the people that run their warranty program. I know you are happy and all, but I would still call the BAR, tell them what happened and see if they want to go stick a microscope up anyone's butt down there.

O once changed the oil in my wife's truck.

When I was done I jumped in it and turned the key.

...
...
crickets
...
...

The starter went out exactly at this point in time. Between starting fine to drive in the garage to change the oil and not starting after the oil change was done.

It was pure coincidence. Not likely, but things do happen randomly and may fall at an inopportune time. I just imagined what I would have told a customer if I was a mechanic. They'd brought their car in for an oil change and I'd come back telling them they needed a new starter! I probably would have had to put it in at cost to keep that customer.

Just an anecdote I wanted to share.

That said, +1 on unethical behavior on the dealer's behalf, sticking the warranty company with the repair.

This is why I prefer buying private party. Pay less and know where you stand with the "taillight warranty".

G