P0126 identifies Insufficient Coolant Temperature for Stable Operation. Diagnosis compares coolant temperature, radiator-outlet temperature, mapped thermostat command, ambient temperature, heater demand, and vehicle speed so its electrical, control, and physical causes are separated before repair.
P0089 identifies Fuel Pressure Regulator 1 Performance. Diagnosis compares requested and actual rail pressure, regulator command, valve current, low-pressure supply, and engine load so its electrical, control, and physical causes are separated before repair.
E18F identifies Central Registry Does Not Match Target Configuration. Diagnosis compares vehicle order, installed control-unit list, registry status, MOST and K-CAN communication, coding history, software identification, and battery voltage so the failed monitored path is separated from secondary effects before repair.
480134 identifies SBS Function Travel Direction Implausible. Diagnosis compares all wheel speeds with direction flags, steering angle, yaw rate, longitudinal acceleration, transmission direction, calibration status, and DSC companion faults so the failed monitored path is separated from secondary effects before repair.
120408 identifies Boost Pressure Control Switch-Off as a Consequence. Diagnosis compares the triggering primary DTC, boost target, actual manifold pressure, throttle request, wastegate command, and engine torque limitation so the failed monitored path is separated from secondary effects before repair.
120308 identifies Boost Pressure Control Plausibility Pressure Too Low. Diagnosis compares boost target, actual manifold pressure, ambient pressure, wastegate command or position, throttle angle, air mass, and engine load so the failed monitored path is separated from secondary effects before repair.
118001 identifies Mixture Control Fuel-Air Mixture Too Lean. Diagnosis compares short- and long-term mixture adaptation, lambda response, MAF, manifold pressure, fuel-pressure targets and actuals, purge command, and idle load so the failed monitored path is separated from secondary effects before repair.
P2458 identifies Diesel Particulate Filter Regeneration Duration. Diagnosis compares regeneration request and state, soot mass, differential pressure, exhaust temperatures, distance, speed, and fuel level so its electrical, control, and physical causes are separated before repair.
P2270 identifies O2 Sensor Signal Stuck Lean Bank 1 Sensor 2. Diagnosis compares Bank 1 Sensor 2 lambda, upstream lambda, fuel trims, catalyst temperature, heater current, and exhaust sealing so its electrical, control, and physical causes are separated before repair.
P2008 identifies Intake Manifold Runner Control Circuit Open Bank 1. Diagnosis compares runner command, actuator current, position feedback, MAP, MAF, rpm, and load so its electrical, control, and physical causes are separated before 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.
P0670 identifies Glow Plug Control Module Control Circuit Malfunction. Diagnosis compares glow request, module status, individual glow current, coolant temperature, supply voltage, and communication state so its electrical, control, and physical causes are separated before repair.