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Hello, can you tell me how many miles are on this?
The biggest issue of course is the injectors serial number need to be programmed into the PCM. If this wasn't done it isn't going to work correctly. This will also cause code for contribution like you have. The other thing is the vehicle can be running normal but the PCM doesn't feel injector 5 is doing its job. As for the glow plug they aren't known to fail lot butninwouodnremovenitnandntestnitnfornthencorrectnresistance? It should be between .6-1.9 ohms igniting ok.