You can find information about the P1633 fault code on this page.
BE WARNED! This particular code can mean a different thing depending on what make the car is, check below.
"Engine control module (ECM) – central processor malfunction"
"Throttle Valve Adaptation; Limp Home Position"
"ECM Malfunction (ETCS Circuit)"
"Battery Overcharge Fault"
"Accelerator Pedal Position Sensor 2 Signal Too Low"
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