You can find information about the P1252 fault code on this page.
BE WARNED! This particular code can mean a different thing depending on what make the car is, check below.
"Start of Injection"
"Pressure Regulator Control Solenoid Valve No. 2 Circuit Malfunction."
"Pressure Regulator Control Solenoid '2' Circuit"
"Start Of Cold Start Injector Open/Short To Ground"
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