1990LS400

That action seems rather dramatic - never heard of someone trying that. Wouldn't it be better to do a proper diagnosis with the correct electronic diagnosis tools?

I thought the LS460 has a timing chain which never is scheduled to be replaced. Whether a car has a timing belt or chain, neither is the cause of a rough idle. On those Lexus cars that actually have a timing belt, up to 2006 at least, the replacement interval was 90,000 miles or 6 years. And, yes timing on Lexus cars do "fail" but it's usually not the belt itself that breaks but one of the other normally replaced components in the system that fails.

The following website may help you: http://www.lexusnavigation.com/index.php

Unfortunately, you probably won't get that kind of mileage over the longer term. The revised EPA estimates for the RWD 2006 GS300 are 19 mpg city; 27 mpg highway; 22 mpg combined: http://www.fueleconomy.gov/!Removed!/calculatorCompareSideBySide.jsp?column=1&id=21978 Manually calculating your fuel mileage over a few tankfulls will allow you to see how accurate your trip computer is.

Probably: Miles per gallon since the last gasoline tank fill-up if you are talking about a message in the instrument cluster display. The message in my LS is simply "TANK AVG".

The 25K service is not much different than the 20K service. It's the 30K service that is a little more extensive but I certainly would not call it "ultra expensive": http://drivers.lexus...0 WSG FINAL.pdf You don't have to use a Lexus dealer - I rarely have in my 307,500 miles and 23 years of driving Lexus vehicles. If you do use the dealer, firmly resist any attempt to "upsell" services to you. Just follow the official maintenance schedule.

I've seen threads on how to clean them and also warnings that they are easily damaged and made unusable. Sewell sells them for $900 if you register to get a forum discount: http://lexus.sewellp...LS400-1991.html Without registering, Sewell's online price is $1227 not including shipping: Part number I'm looking at is 22250-50010 You might try looking for one a used one at a salvage company. According to Sewell's website and http://www.toyodiy.com , the same MAF sensor is used on all 90-94 LS400's.

About all I can do is to provide a link to a thread you may have already found and which I cannot confirm is accurate: http://us.lexusownersclub.com/forums/topic/66255-key-programming-instructions-for-a-2002-es300/ Like the OP of that thread said, "Timing is critical". I watched a Lexus dealer service writer program four new keys - 2 remote, 2 valet - when my 00 LS came with only one set. It sometimes took him more than one attempt but he was doing it without written instructions.

What does "Got it working" mean? Through the USB port? Through the aux-in? Wirelessly?

Per the photo in your owners manual, it looks like there is a 3.5mm aux-in next to the USB port: http://drivers.lexus...f/sec_03_02.pdf Pairing instructions can be viewed at https://secure.drivers.lexus.com/lexusdrivers/info/my-lexus/resources/bluetooth.do Select the "Step 4 - View Instructions" tab after inputting your vehicle and phone information.

The Lexus dealer didn't diagnose the problem?

I don't see the iPhone listed on page 291 of your navigation manual as being compatible with a USB connection - only iPods of certain models. I think I see a statement about the iPhone not being compatible on a USB connection: http://drivers.lexus...A78A/pdf/07.pdf Have you tried a wireless audio (Bluetooth A2DP) connection? That's the only way I've been able to stream audio from our phones (iPhone and Droid) to the nav/audio system in our 2012 Prius. But I can plug a simple memory stick or SD card on an adapter into the Prius USB port and have the nav display and play all the audio content on them. I assume you could plug the audio-out (headphone jack) on your iPhone into the 3.5mm audio input jack in your RX .... I can do that with our phones in the Prius but there isn't any reason to do that since the wireless audio connection works great.

Instructions are in this thread which I found by searching this forum: http://us.lexusownersclub.com/forums/topic/65319-reset-oil-maintenance-required-light/page__hl__++reset%20++oil#entry458677

More informaiton would have helped ... carrier, exact phone model. Phone compatibility information (which features are supported) can be viewed at https://secure.drive...es/bluetooth.do From what I've seen, 99%+ of issues are due to phone incompatibility or, more commonly, user error.

Does your phone pair at all? Can you make or receive calls via Bluetooth? Do other phone based services such as Pandora work properly? Can you stream music stored on your phone via Bluetooth to your audio system?

If you want to verify your true speed, consider buying an inexpensive portable GPS - Garmin, Magellan, Tom-Tom. The speed display on all the one's we've owned have been more accurate than car speedometers. I probably pay more attention to the speed shown on my Garmin than the speedometer in my LS.

You might check the reviews and customer ratings at http://www.tirerack.com/index_w.jsp I had a set of RE750 on my LS and they were the best handling tires I've ever bought - didn't last long but there probably weren't made to and the fun made of for the relatively short life (22,000?). I suspect other brands/models of ultra high performance tires would not have lasted any longer.

This thread was begun in 2010 and it appears that the Lexus/Bluetooth site has changed since then. Try the following link for information: https://secure.drivers.lexus.com/lexusdrivers/info/my-lexus/resources/bluetooth.do

Any error message on the display? Was the CD changer working correctly recently? Are the CD's loaded in the cartridge correctly? (Have you reloaded CD's since the last time it worked correctly?)

There are two posts in the following Apple Community forum from an RX330 owner who first couldn't get his iPhone 5 paired and then he did by following the pairing instructions. He didn't provide details though on what he did differently to get it to pair: https://discussions.apple.com/thread/4407146?start=0&tstart=0 There are no instructions for pairing an iPhone 5 to an RX330 but you can see the pairing instructions for an iPhone's up to 4S at: https://secure.drivers.lexus.com/lexusdrivers/info/my-lexus/resources/bluetooth.do

You're expecting complete competence from a minimum wage tow truck operator? I recently read on another Lexus forum about how a tow truck operator serverely trashed a Lexus LS electrical system when he reversed the jumper cables while jump starting the engine. It's pretty common to have to do a reset after a battery change but 2000 was the last model year in which the LS owners manual told how to do it. I don't see anything in the 2007 LS460 owners manual that says there has to be a reset to get all the warning lights to work after a battery change but the owners manual is huge and I could be missing it. There are instructions on this forum on how to reset the VSC light for the LS430 with a paperclip on two OBDC terminals but I wouldn't recommend trying it on an LS460. Maybe it's not progress as far as car owners are concerned but there seems to be a trend for things like resetting automotive systems to have to be done with electronic diagnostic tools. Your statement that "Surely this can be corrected without visit to dealer" is not necessarily the case.

As explained in your owners manual, a flashing A/C button light means that the A/C compressor is not operating. The problem could be simple but it will probably take someone familiar with A/C systems to diagnose the problem. A Lexus dealer or independent shop specializing in Lexus/Toyota may be your best bet.

What "lot of problems" are you talking about? By "problems" do you mean a lack of features that were added to navigation systems in later model years? Tell us and maybe someone can comment. Yes, the safety lockout feature continues after the update although you will no longer have to press the "I Agree" button - there are aftermarket products you can buy to defeat the safety lockout. Edit: Whoops! I may be mistaken about a nav update getting rid of having to press the "I Agree" button - may apply only to later nav system versions. I love our Garmins - we have two inexpensive (currenlty about $200) 2595 LMT with 5" inch screens - one is mounted on a bracket by my radio and hardwired into my 00 LS electrical system and the other my wife uses on business trips in rental cars. Our Garmins have excellent voice control for making phone calls and entering destinations, advertising free traffic information with rerouting around traffic jams, and amazing integration with my Android cell phone where I can do things like send location information for businesses from Yelp and YP on my phone to the Garmin via Bluetooth and even be guided back to my parked car by the Garmin SmartPhone Link app (available only for Android) running on my phone. That said, I think $169 is a small price to pay for much newer maps if your current maps are old. If you want newer features and are willing to spend the money, there are numerous threads on the ClubLexus forum about installing aftermarket indash navigation systems - requires installing an HVAC control unit from a non-nav GS.

Gosh, an update is pretty darn cheap and you can install it yourself: http://www.lexusnavigation.com/what_to_order.php

Do a Google search on "SC430 spare tire" and you will find LOTS of information about what fits. There are also past threads about this on this forum you can find by doing a search - I contributed to some of them.