Description
This Delphi common rail fuel pressure sensor, OEM number 9307Z521A and alternate reference 55PP22-01, is an original engine fuel system component. It is designed for common rail diesel applications and serves as a direct replacement only where these exact numbers are specified.
Its job is to monitor fuel pressure inside the rail and send an accurate signal to the engine management system. That input helps the ECU control injection timing and fuel delivery correctly, supporting smooth starting, stable running, proper throttle response and efficient combustion.
Common signs of a faulty unit include hard starting, poor idle quality, hesitation under load, reduced performance, warning lights, limp mode or fault codes related to rail pressure readings. In some cases, inaccurate pressure data can also lead to over-fuelling, under-fuelling or intermittent stalling.
This is a used original part, removed from a vehicle and tested before sale. Match 9307Z521A and 55PP22-01 exactly before ordering. Professional installation is recommended, and as with fuel system electronic components, diagnosis and system calibration may be required after fitting.
Returns accepted only for genuine faults — faulty on arrival, not as described, or wrong part supplied — requested within 14 days, with all 3 anti-tamper stickers intact. No returns for change of mind, incorrect installation, coding/programming, or buyer compatibility errors; checking compatibility (OEM number, firmware, vehicle) is the buyer’s responsibility. Full policy: https://giantparts.eu/refund-and-returns/
