My 2012toyota hilux 2kd engine,has had difficulty to start, prior to that it was fine, I took it to a service station where oil was changed and I also changed its battery then I went a distance of about 250km, to and fro ,the next day morning I tried to start it, it was totally unable to start, I called on a wiring expert who came with a computer and diagnosis was done, and it showed that there was no or very less injector pressure, the next day I called a mechanic who came and replaced the injectior sensor but the problem persists, he replaced injector pump but still, the same problem exist, what shall I do?