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Old 07-30-2007, 08:37 PM   #1 (permalink)
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Gen6 Speedometer Error

Driving home from vacation yesterday I noticed when passing the speed radar on the highway that it said I was doing 72 when the speedometer said i was doing 76. The same held true at the 2nd and 3rd ones I passed. My GPS unit matched the readings from the radar checkpoints. I'm trying to book an appointment with Toyota but was wondering if anyone else has had the same issue?
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Old 07-30-2007, 09:28 PM   #2 (permalink)
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Do you have the stock tires and wheels? I know aftermarket ones with a slightly different tire cause the speedomete not to register correctly.
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Old 07-30-2007, 09:38 PM   #3 (permalink)
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I've had the same issue with my last 5 Toyotas. It is a slight error they seem to build in on the high side and I don't think there is anything they can do about it. If you have any luck, get the specifics of the repair, please. I've never had any luck, and just figure it accordingly.
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Old 07-30-2007, 09:43 PM   #4 (permalink)
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Originally Posted by DBIGMAC1
Driving home from vacation yesterday I noticed when passing the speed radar on the highway that it said I was doing 72 when the speedometer said i was doing 76. The same held true at the 2nd and 3rd ones I passed. My GPS unit matched the readings from the radar checkpoints. I'm trying to book an appointment with Toyota but was wondering if anyone else has had the same issue?
My speedometer reads about 3 mph high also with stock tires also.
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Old 07-31-2007, 12:12 AM   #5 (permalink)
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Yea, stock tires (steel rims & hub caps) <-- I need the 20hp I get from the hub caps.
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Old 07-31-2007, 08:29 AM   #6 (permalink)
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I have the opposite problems with my SE V6.

Mine reads lower than I'm actually going at highway speeds. That's my suspicion anyway.

I've ran side by side with my dad and while his car shows 120, I'm doing just 116.
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Old 07-31-2007, 08:45 AM   #7 (permalink)
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The car manufacturers know there is going to be SOME speedometer error in almost every car, so they design them to read just a little high. Look at every professional test done b y the car magazines, where they use instruments to measure actual speed, indicated speed is always lower.

Some people check their speedo by driving along behind or in front with somebody else in another car at some agreed upon speed and just note the difference. If it reads two or three miles higher than actual speed i dont see much problem, at least not one worth throwing lots of money at. If it reads too low then its a warranty issue and they can probably fix it by reprogramming or something that wont take days to fix.

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Old 07-31-2007, 08:52 AM   #8 (permalink)
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You also need to account for errors in the radar based on your distance from it and it's own calibration. Usually the ones that are left on the side of the road for display are off by a few mph.
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Old 07-31-2007, 09:05 AM   #9 (permalink)
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I say you just leave it be. Having a speedometer thats not calibrated will get you out of a speeding ticket!
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Old 07-31-2007, 09:28 AM   #10 (permalink)
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No it won't. Your own inability to maintain proper working equipment is no excuse for violating the law. Non-calibrated radar is another story.
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Old 07-31-2007, 03:02 PM   #11 (permalink)
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Originally Posted by wireless
No it won't. Your own inability to maintain proper working equipment is no excuse for violating the law. Non-calibrated radar is another story.
It can at times.

Not all states have that law.

Minnesota does, but a Judge will usually take a mechanical problem into account as long as it's repaired. I've beat several tickets that way (and helped family).
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Old 07-31-2007, 03:18 PM   #12 (permalink)
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Quote:
Originally Posted by TRD VVTi
It can at times.

Not all states have that law.

Minnesota does, but a Judge will usually take a mechanical problem into account as long as it's repaired. I've beat several tickets that way (and helped family).
They also elected The Body to run the state...not much for credibility j/k

Seriously though, since when is ignorance of the law or negligence of maintenance to legal regulations allowable exemption from following it? I guess I am too used to living in Virginia where traffic enforcement is taken über seriously.
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Old 07-31-2007, 04:29 PM   #13 (permalink)
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Yes it is taken alot more seriously in VA. Which is why I like driving in VA, cuz they get the other dumbasses off the road, but in MD, if your speedometer is not calibrated, you will get off from the ticket. The court takes into consideration the possibility of mechanical error from the factory, also that you had no way of knowing it was off, nor is it required for you to have it checked. There's loopholes foreverything, sometimes taht isn't good.
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Old 07-31-2007, 04:45 PM   #14 (permalink)
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I thought I was the only one with this "issue" as well. Passing one of those "your speed limit" radar trailers, everyday and mine reads 4-5 mph too high. I have a portable Garmin GPS unit which states the same....the speedometer is reading 4-5mph too high.

Occurred when new on stock tires and steel wheels, and problem still exists with new tires on the genuine Toyota 16inch alloy wheels.

Over the long run, doesn't this mean that you will have more miles than actually driven? Let's say I drive for 1 hour at 70mph constant according to the speedometer which is reading 4-5 mph too high. Doesn't that mean I've "actually" driven 65-66 miles during that hour, even though the odometer says 70 miles during that 1 hour?
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Old 08-02-2007, 12:57 PM   #15 (permalink)
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Quote:
Originally Posted by Yazovets
I have the opposite problems with my SE V6.

Mine reads lower than I'm actually going at highway speeds. That's my suspicion anyway.

I've ran side by side with my dad and while his car shows 120, I'm doing just 116.

How do you know your dad's car's speedometer is accurate? His can be off on the high side even more than your car.

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