fritzman81

Hi All, I originally posted my IS250 Speedo Issue back in April 2007, I had reported the fault to Lexus 1 week after I purchased the car in September 2006. October 2007 Lexus fitted my car with a new instrument cluster with "Updated Speedo Software", my car was by this time over 12 months old. I would like to report that the problem has been sorted, my speedo is now almost exact in every way. Thank you Lexus, but it shouldn't have taken so long. And why did you fix a fault, that you tried to tell me wasn't a fault at all? Happy IS250 Owner

Yes! But it's even better for the Speedometer to be correct.

I use a program called GPS dash, that is loaded on my PDA, and I link it to a SIRF3 Bluetooth GPS. However, you can just time the vehicle over a know distance, sometimes they have distance markers set out on major roads, if you can find some in your area.

Hi All, I have had my IS250 Prestige since September 2006, and from the time I picked up the car I noticed that the speedometer over read by about 8 Km/h. I had it back to Lexus in the first week for testing, and they confirmed my figures, but stated; Acceptable Variation, on the test results sheet from RACQ. Further testing myself, has shown that although the speedometer is out by 8 Km/h across the range, the odometer over reads by only about 1%. This means that it is not just a simple ratio mismatch, but a design or programming fault within the speedometer. I have contacted Lexus several times; however they simply quote the ADR's: ADR (18/03): Requires vehicle speedometers to indicate a speed equal to or higher than actual vehicle speed, and no more than 10% + 6Km/h higher than actual speed. Example: If actual vehicle speed is 100 Km/h, the vehicle speedometer must indicate no less than 100 Km/h and no greater than 116 Km/h. There is also a Lexus Technical Newsflash, dated 26/4/2006 Ref No. LNF11/06 This basically tells the dealers to do nothing if the speedometer is within the ADR's. Personally, I feel the ADR limit is ridiculously high, and perhaps if I had purchased a Hyundai I would expect that. But I think it is very poor for a Lexus, and is by far the worst of any car I have ever owned. Last week I had my IS250 in for the first service. I was given a very new IS250 Sport as a loan car for the day. The car had the 18in wheels on it, it so I took the opportunity to do some more testing. I found that having the bigger wheels (plus greater rolling diameter) had slightly improved the speedometer; it was only 6 Km/h over across the range. However it had now pushed the odometer down to under read by about 1%. So it seems the same fault still exists, it has just shifted slightly. Does anyone else have similar issues? I also have copies of the Lexus Newsflash, ADR statement, and RACQ Speedometer test results if anyone wants a copy.