Hi John. po725 is crank sensor and p1335 is that the ecu is not sending an engine speed signal to the pump. ( It can't if the crank sensor is not sending a signal to the Ecu). I have fitted a few Crank sensors to these, and also had a couple that were not plugged in correctly. They plug in on a bracket in front of the Engine, Under the plastic cover, Fairly easy to get to. H.T.H.