2000 Cavalier ABS Problem

My ABS,TRAC OFF and Service light has been on for a week. So I had it scanned at a dealer for codes. They said my right front sensor was bad, so I had them replace it. Before I got off the lot the ABS light came back on, the mechanic put the car back on the hoist and plugged the scanner back in, he showed me the graphics on the scanner when he turnt each wheel, he first spun the left front wheel no problem, spun the right front no problem. right rear no problem, but when he spun the left rear wheel it showed up on the scanner diagram as right front wheel. Now he tells me I might have a wiring problem and it could take minutes or hours to find it, after spending $300.00 and the problem wasn't fixed, I wasn't in the mood to listen to him any longer, especially when he tells me he hasn't seen this happen before. Anybody else have this problem, sure would appreciate to hear what the cause was.

check wiring connection at connector ,physical wire could be broken inside insulation at connector
very common problem but mostly at front wheel speed sensor connectors

My ABS,TRAC OFF and Service light has been on for a week. So I had it scanned at a dealer for codes. They said my right front sensor was bad, so I had them replace it. Before I got off the lot the ABS light came back on, the mechanic put the car back on the hoist and plugged the scanner back in, he showed me the graphics on the scanner when he turnt each wheel, he first spun the left front wheel no problem, spun the right front no problem. right rear no problem, but when he spun the left rear wheel it showed up on the scanner diagram as right front wheel. Now he tells me I might have a wiring problem and it could take minutes or hours to find it, after spending $300.00 and the problem wasn't fixed, I wasn't in the mood to listen to him any longer, especially when he tells me he hasn't seen this happen before. Anybody else have this problem, sure would appreciate to hear what the cause was.
Hey, i'm having the same problem with my cav. did you ever get your's fixed? mine's due to go into the dealership tomorrow, i have no idea what to expect to pay. oh and also what was the problem with your's