Inyector reacondicionado instalado con su código original

An injector that has been reconditioned and refitted carrying the calibration code printed on it when it was new, which no longer describes what it now does. The code is not a part number — it is a measured record of that individual injector's flow, written into the module so it can correct each one's opening time.

Reconditioning changes the flow, so the old code becomes a lie the module believes. It commands a duration corrected for an injector that no longer exists, that cylinder receives the wrong quantity, and the result is a balance or correction fault with a mechanically perfect injector fitted. The fault survives every physical test, which is what makes it worth naming.

A reconditioned injector must arrive with a new code and that code must be programmed in. Two failure modes follow: a rebuilder who does not recalibrate and reprint, and a fitter who does not enter the new value. Read back the stored codes and compare them against what is printed on the injectors — a mismatch is the whole diagnosis and takes a minute, and note that the codes are position-specific, so injectors moved between cylinders need their codes moved with them.