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Without putting it on a scanner, replace the speed sensor first. Yes this is why the light is on and it failed. They are around the output shaft. No year, make, or model. So it hard to tell you about where it is at.
Just to clear things up, there is no such code as "502" on a 1999 Chevrolet Venture. There is however a code P0502, which is low input for the vehicle speed sensor. This may sound like symantics, but it can make a huge difference when you are trying to diagnose fault codes. There is also a B0502 that is a possible code on that vehicle, so when you post a code, you need to post the ENTIRE code number including the prefix letter. (there are also U-codes and C-codes used on that vehicle)
Anyway, I'm done preaching...back to your question: Your vehicle speed sensor (VSS) probably got unplugged when the work was done and someone forgot to plug it back in.
The VSS is located in the transmission housing on the right side of the vehicle near where the right axle shaft goes into the transmission.
i had a customer with a 2004 gmc sierra 2500hd 2wd that stated that the srevice brake system light came on while driving. the transmission would shift hard and erratic plus the speedometer was erratic. the check engine light came on with two codes p0502 and p0503(vehicle speed sensor A low input and vehicle speed sensor A intermittent/erratic. i replaced both vehicle speed sensors mounted on the driver's side of the transmission. both of the speed sensors were the same. test drove the truck after and all issue were solved.
P0404 Exhaust Gas Recirculation Circuit Range/Performance P0502 Vehicle Speed Sensor Low Input P0440 Evaporative Emission Control System Malfunction
hope that helps /a little beyond my expertise but theres your codes your looking for ;)