A scanner is your only solution while everything else will be "check wiring for breakage and cracking insulation" process. The speed sensors can get old, weak causing poor readings, they get clogged with dirt from those who like to go "off roading" due to poor driving skills.
Access to a scanner will provide codes, location of error, and will confirm your repair. Everything else will be a "try this then try that" approach.
If you want to drive up to VA, I have four speed sensors you can play with to determine which wheel is your issue.
Current Garage Highlights
2003 525iT TiSilver
2002 M5 TiSilver
1998 528i KASCHMIRBEIGE METALLIC (301) (Goldie)
Former Garage Highlights
2005 X5 4.8is
2004 325iTs (2x)
1973 Pantera L
1971 Dodge Dart Swinger "Lite Package"
1970 Dodge Challenger T/A 340 Six Pack Alpine White
1970 Dodge Challenger T/A 340 Six Pack GoManGo Green
1969 Road Runner 383
1968 Barracuda Formula S 340 Sea Foam Green
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