Injector coding

Peter Hendron On a 2004 Vauxhall Vectra 1.9 diesel with the 8-valve engine do the injectors have to be coded to the ECU? I have an engine with a broken timing belt and I’m in the process of changing bits over to an engine with much lower mileage. I have the original injectors from the old engine ready to go into their respective positions in the new engine. Not all common-rail engines require the injectors to be coded in. With the Vectra, both the 19DT or 19DTH engine require a replacement injector to be coded into the engine ECU. The injector will be marked with a QR code, which contains the correction data required by the ECU for compensating manufacturing tolerances. The injector code can be programmed into the ECU using Tech2 software.

Similarly, if the ECU is replaced then the existing injectors would need to be coded into the new ECU. However, as you are fitting existing injectors into a replacement engine in the same order as they were removed, using the existing ECU coding will not be necessary as the ECU will already be set to accept the injectors.