Quote:
Originally Posted by macmac80210
I checked the battery voltage at idle, it is at a steady 13.5v. It is about 14 while driving. I do not suspect this to be enough to cause an issue with speedometer. I have never had any trouble with starting the car. I might just give in and take it to a stealership and pay them to figure it out and fix it.
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Hmmm... well, that would eliminate the battery as the potential culprit.
Checking the Speed Sensor is zero cost, why not try that first? Even if you decide to buy / replace that sensor, you can get it for around $100+ from vendors like Autohaus - Link:
Your Parts Search Returned 1 Part(s)
You can also get it from FCP Euro - Link:
BMW Wheel Speed Sensor Rear (X5 E53) - VDO 34526756380V | FCP Euro
Also from OEMBIMMERPARTS - Link:
BMW X5 ABS Speed Sensor OEM 2000-09/2003
As far as I know, dealers will charge you about $150 just for diagnosis or to scan your car.