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Injector Coding Explained: Why Your Van Misfires After ‘New’ Injectors
“Plug-and-Play” Injectors Are a Myth
Modern Renault & Vauxhall diesels store a 30-digit C2i/C3i trim code in the ECU.
Skip the coding step and the ECU sprays fuel as if the old injector were still fitted—cue rough idle, smoke and P0201-P02XX fault codes.
What Is Coding?
Entering each injector’s unique flow-rate number into the ECU so it can balance fuel delivery within ±1 µs.