You can find information about the P1550 fault code on this page.
BE WARNED! This particular code can mean a different thing depending on what make the car is, check below.
"Charge Pressure Deviation"
"Idle Speed Control valve Closing Solenoid Control Circuit Electrical"
"Power Steering Pressure Sensor out of Self-Test Range"
"Knock sensor (KS) – signal malfunction"
"TCC Solenoid Valve"
"Charge Pressure Control Difference"
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