SpicedRum

I'm just inquiring if the OP can change the thread title to "Odometer issues" or similar to make the thread easier to find, especially as it ages. Currently the title doesn't reflect this important content and I'm sure folks will want to locate it easily down the road in case of problems.

mikedog139

Update: I took my car in and the service manager stated that there is nothing wrong with my Odometer. He said that Lexus would fix any issues like that right away because of lawsuits and Lexus spend millions on recalls when any issues are found. I feel they fixed the issue and did not tell me. I now pay close attention to my Odometer (miles) and I try to drive the car as little as possible. I never had this issue with my 2001 Lexus GS 300 and the current issue seems to be with GS350 F from speaking with other owners. I'm more worried about mileage than enjoying it.

bclexus

Mike - You never had a problem with your odometer...and you can bet the family jewels that they did not fix (what you thought was) the issue and did not tell you. Like I said - It was a total figment of your wild and strange imagination.

Why are you more worried about mileage than enjoying your car? Is it some kind of collector car to you, or are you trying to make it a 'garage queen'? Maybe you need more of a normal car that will allow you to be normal...

Also, tell the person you spoke with who works in your building that claimed to have the same issue with her 2016 Lexus GS 350 F-Sport that she must be very gullible because she allowed herself to be talked into thinking she had the same problem as you, which does not exist.

drgrant

I always reset Trip A every time I fill up my gas tank. That would give you a better idea of whats going on (if anything) because if it's way off, the trip odo would be
too, they both use the same mechanisms to measure miles.

As far as a common issue, I've never heard of this being an issue.

-Mike

bb700092

Thanks for sharing this useful thread. I have a similar issue as reported in the above thread by many.

My 2016 GS (purchased brand new) came from the factory with 225/50R17 tires. Most non-F-Sport 4GS come with 235/45R18 tires. The circumferences of the 17" and 18" tires are 81.24" and 82.71" respectively (ref. http://www.1010tires.com/Tools/Tire-...5R18/235-50R17), i.e. the difference in circumferences is almost 1.5" which is not insignificant.

To go one mile, the 235/45R18 revolves 14.3 times less than the 225/50R17. Thus, if the speedometer/odometer of my GS is tuned for the 235/45R18, it will show 1 mile has been covered when 14.3 times the circumference of 225/50R17 is still left to go. That is, my GS's speedometer/odometer is calculating 1.78% too fast. Therefore, when my speedometer shows 70 mph, I am actually traveling at 68.74 mph. However, I tested with two Garmin GPS systems and cell phone Waze app, and they showed even more difference. They consistently showed 66-67 mph when I am traveling at 70 mph on cruise control; this observation is in line with the thread above.

Last time when I went to my Lexus dealership for service, the loaner RX I received had a much more accurate speedometer than my GS. In the RX, I set the cruise at 70 mph and my GPSes showed 69 mph while my cell phone app Waze varied between 69 and 70 mph. So not all Lexus vehicles are equally affected.

If my odometer is off by 5% (i.e. shows 70 miles when it is actually 66.5 miles), I will lose 0.05x60,000 miles = 3,000 miles from my warranty which concerns me. I have reported this to Lexus corporate and they advised me to talk to my local dealership and get my odometer checked. When I requested my local dealership, they did not check anything (did not even touch my car) and said that what I am stating is within specifications and the odometer and speedometer get data from different sensors (so an error in the speedometer does not imply an error in the odometer) and that I am just being too nitpicky. At that time, my GS had about 2000 miles on the odometer, so tire wear is not a factor in the above observations. I had given up since that is the only Lexus dealership within three hours from my home until I came across the above thread.

To be continued ...

drgrant

So why did your car not have tthe correct wheels/tires on it to begin with? I've never even seen a recent model GS with 17" tires on it.... maybe some weird skinflint trim level?

That said, 3000 miles for people that drive their cars a lot, is pretty much lost in the noise. I put that on my car in under 2 months, lol. Yeah I'd be annoyed too but in the grand scheme of things 3000 miles on the clock is unlikely to be this huge linchpin in terms of warranty. And these cars are generally so damned reliable that its doubful that much of anything thats covered is going to blow up in 100K never mind 50, given at least a halfway decent attempt at maintenance.

I am surprised that Lexus doesn't provide a way for the dealers to adjust this wheel offset vs sensor problem, though.

-Mike

bb700092

I have the correct tires/wheels. As stated, that is what came from the factory. By default, GS 200t models come with 17" wheels and have the option to upgrade to 18" wheels for $900 more (in 2016). I did not like the 18" wheels Lexus was offering, so I wanted to save that $900 and go for aftermarket wheels, probably 19" ones, at a later date. Having said that, the 17" ones are pretty useful in the snow which I am realizing this winter.

Mike728

If you were sold your GS with 225/50R17's you should have complained. The stock 17" size is 235/50R17. The difference between them and the upgraded 18" is 3 rev's a mile. (82.4" to 82.7")

bb700092

I believe you got the 235/50R17 info from Lexus.com. I did complain and the service manager at my local dealership told me that that info is incorrect. He showed me my window sticker which stated 225/50R17 and a document they received directly from Lexus (see attached). The document had info on 225/50R17, 235/45R18, 235/40R19 and 265/35R19, but no mention of 235/50R17.

Mike728

If that's the case, then someone screwed up. I hope they fixed the issue since 2016.

drgrant

Oh it's a 200T, that explains it. My mistake I assumed it was a 350... (you didn't say in your original post).

-Mike

Knucklebus

I just completed a 1200+ round trip to Florida. On several stretches of I-75 I set the odometer to 0 at the state line and in 100 miles it is showing 100.4 miles on the car. That is exactly 0.4% in my car with Conti DWS tires with the "S" about to fade out. I'm guessing new tires would reduce this to half that.

Additionally, the speedometer appears to be about 2MPH GPS fast at as low as 10MPH and I've seen it show 90MPH at 87MPH GPS. It is almost as if the speedometer needle was affixed incorrectly OR the speedometer mechanism was installed a few degrees off the proper axis since it is not a percentage wrong but rather a 2-3MPH error in display across the spectrum.

I'm thinking of putting 245/45-18 tires on the next time to get the error more in line. That will be a compromise that puts my MPH only 1-2MPH fast and my odometer at 0.6% slow when new.

bclexus

I am running Pirelli Cinturato P7 A/S Plus tires in 245/45R18 100V size.

Knucklebus

Did yours have 235/45 or did you start with 245/45? Notice any difference if you +1 the tires?

bclexus

Mine came with the standard OE 235/45R18 (Dunlap) tires, but I went up one size (245/45R18) when I replaced them - first with a set of Michelin Premier tires (which didn't last anytime) and later with the Pirelli Cinturato P7 A/S Plus tires I have now.

I can't say there's any significant handling difference due to the 1+ size, but there definitely is a significant difference is ride quality and quietness that I was looking to gain over the OE size and brand tires. I couldn't care less about gaining [handling] performance in a heavy luxury sedan that I don't track, but instead I carry a ton of golf stuff in the trunk.