Passenger Seat Occupancy Sensor from 2002 R170 SLK230, VIN: WDBKK49F42F270042. I purchased this seat occupancy sensor in case it was needed to troubleshoot SRS error code. My MB dealer was able to reconfigure an SRS module from a 2001 SLK320 to work in my 2004 SLK320 without replacing any other SRS components besides the module itself. So I have this occupancy seat sensor available. Part number is 170-820-27-10. This seat sensor could be used to verify whether or not an SRS passenger seat sensor is causing an SRS error by connecting it to the yellow connector under the seat without actually installing it into the seat. Price: $80 including shipping in Continental USA.