📖 DEFINED CALIBRATION CONCEPT · v1.0.44

Primary Wideband (LSU 4.9 / ADV) vs Rear Narrowband O2

Turbo-petrol and diesel ECUs use an upstream planar wideband Lambda sensor (Sensor 1) for real-time closed-loop Air-Fuel Ratio (AFR) fuel control, and a downstream narrowband sensor (Sensor 2) strictly to monitor catalytic converter oxygen-storage efficiency (P0420 / P0430).

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Practical Workshop & Calibration Engineering Application

Stage 2 Catalyst Off disables only the downstream Sensor 2 efficiency monitor while preserving 100% primary wideband closed-loop fueling safety.

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100% Virgin Original ECU File DAMOS, ASAP2 Bench Service Mode TPROT CVN Virtual Read SCR AdBlue "No Start in XXX km" Inducement Lock DPF OPF / GPF High-Pressure Cerine / Eolys Fuel-Borne Catalyst Additive Intake Swirl Flaps & Tumble Generator Valves Torque-to-Injection-Quantity Driver Wish Diesel Smoke Limiter SOI Injector Duration VNT / VGT Variable Nozzle Turbocharger Duty & Setpoint Common-Rail Fuel Pressure DSG / S-Tronic Hydraulic Clutch Clamping Pressure ZF 8HP Line Pressure, Torque Cap & Shift-Time Calibration SAE J1939 SPN / FMI Heavy-Duty 24V Diagnostic Protocol 24V Dual-Module Architecture: MCM/EMS + ACM/EEC3 Mercedes-Benz CPC_NG Selective Path-Level DTC Fault Class Deactivation Overrun Fuel-Cut Delay & Crackle / Burble Ignition Retard Hardcut / Popcorn Stationary & Dynamic Rev Limiter Primary Wideband MAF Tricore PFlash SAE J2534 PassThru & CAN-FD Diagnostic Interfaces Marine WOT Auto Start-Stop Temperature / Voltage Hysteresis Deactivation 3-Bar / 4-Bar MAP Boost Sensor Voltage Linearization

ENGINEERING Q&A

Frequently Asked Technical Questions

What is Primary Wideband (LSU 4.9 / ADV) vs Rear Narrowband O2 in ECU tuning?

Why does Primary Wideband (LSU 4.9 / ADV) vs Rear Narrowband O2 matter during workshop flashing?

Stage 2 Catalyst Off disables only the downstream Sensor 2 efficiency monitor while preserving 100% primary wideband closed-loop fueling safety.