5WS40156-Z vs 5WS40156
How the 5WS40156-Z (Siemens VDO (Continental)) relates to 5WS40156 — Base Siemens number for this injector..
5WS40156-Z
Siemens VDO (Continental) · Piezo · Common Rail
Siemens VDO / Continental piezo common-rail injector for the PSA DW10BTED4 (RHR) 2.0 HDi engine, also used by Volvo (2.0 D), Ford and Fiat. PSA OE 1980J5; Ford 3M5Q-9F593-DB; Fiat 9657144580. Suffix matters - 5WS40156 variants are not interchangeable; match the exact suffix and engine code. Coding required after fitting. Key symptoms: Hard starting / non-start; Rough or unstable idle, jerking; Loss of power and warning light; Excessive smoke. Common failure modes: Excessive leak-back / internal leakage; Piezo stack electrical failure; Poor spray pattern / nozzle coking.