Blog · OBDThink — Page 5

BMW P0755: Shift Solenoid B Malfunction — Diagnosis and Repair

P0755 identifies Shift Solenoid B Malfunction. Diagnosis compares Solenoid B command, measured current, commanded gear, turbine speed, output speed, fluid temperature, and ratio so its electrical, control, and physical causes are separated before repair.

BMW P2200: NOx Sensor Circuit Bank 1 — Diagnosis and Repair

P2200 identifies NOx Sensor Circuit Bank 1. Diagnosis compares NOx concentration, sensor status, heater current, exhaust temperature, supply voltage, and SCR dosing state so the failed electrical or mechanical path is isolated before repair.