E46 M52TU/M54/M56 Fuel Injectors: Exact Engine, SULEV and Service Identification

Checked BMW catalog chains are 13641427240 -> 13537546244 and 13641439800 -> 13537546245. These are two separate ordinary E46 injector families, not one combined chain. M56 13537515267 remains a third, emissions-specific identity with its own rail/seal diagram; it is not a supersession of 13537546244 or 13537546245. The O-rings, clamp and M56 rail numbers are related service components, not injector supersessions.

Start with VIN, US emissions label and exact engine, then read the installed injector number. M52TU 323/328 and M54B25 325 applications in the checked catalog resolve to 13537546244; M54B30 330 applications resolve to 13537546245; an M56 SULEV 325 resolves to 13537515267. Factory RWD and factory xi/AWD models are included only where the checked BMW catalog explicitly lists the same engine-specific number; this is not a general RWD/AWD interchange rule. Do not identify an injector by seller year range, connector color, an 'EV1' label, advertised flow rate or engine family alone. Compare the stamped/molded number, electrical connector housing and key, connector clocking, body length, inlet/outlet form, rail clip groove and seal arrangement. The checked BMW diagrams do not establish a universal spacer: if a cleaner or kit supplies filter baskets, pintle caps or spacers, require exact-injector compatibility and an itemized parts list. Diagnose DME faults, cylinder contribution/misfire, ignition, compression, intake leaks, fuel pressure and wiring before condemning an injector. BMW SIB 13 01 07 supports an approved in-car deposit-cleaning procedure for M54 and M56 with BMW-specified tool/fluid, ventilation, nitrile gloves and safety glasses; it does not cover M52TU and does not support improvised solvent rigs. For off-car professional service, request documented electrical/coil checks, leak-down, spray-pattern and dynamic-flow tests before and after cleaning, matched-set comparison, and correct new seals/service pieces. Relieve fuel pressure and follow current BMW repair information; keep gasoline away from heat, sparks and flames, work in a ventilated area, disconnect the battery as directed and leak-check every injector/rail joint before release. Do not defeat or convert the M56 emissions system.

Checked sourcing choices are exact-number Genuine BMW injectors, exact-branch specialist-remanufactured/rebuilt injectors and professional service of the installed port-injector set. A remanufacturer or cleaner should confirm the stamped OE identity and connector, test electrical condition, leakage, spray pattern and dynamic flow, report before/after results, and state which O-rings, filters, caps or spacers were replaced. A used injector is a core or test-first option, not verified fitment or condition. Do not substitute an advertised high-flow, generic 'upgrade,' M54 injector for M56, M56 injector for M54, or 13537546244 for 13537546245 without an explicit application from the injector manufacturer and calibration authority; this guide makes no flow-rate, performance or tuning recommendation.

Confirm the VIN, US emissions label, exact M52TU/M54B25/M54B30/M56 engine and installed injector number before ordering. Use 13537546244 only for its checked 323/328/325/325xi branch, 13537546245 only for its checked 330/330xi branch, and 13537515267 only for an identified M56 SULEV 325i/325Ci. Similar connector appearance, seller year range, flow claim or RWD/AWD label is not interchange proof. M56 uses a distinct rail/seal arrangement and must not be converted with ordinary M54 parts. Confirm connector/keying, body and clip groove, supplied O-rings/caps/filters/spacers, test report, core, warranty and quantity. Diagnose ignition, compression, intake leaks, fuel pressure and wiring before replacement. Use only an approved professional cleaning/test process, observe gasoline fire/PPE/ventilation precautions, follow current BMW repair information and leak-check every disturbed joint. No emissions defeat, performance substitution or calibration advice is provided.

Supersede reviewed 21 unique research sources for this guide. 10 also appear above as a seller or official action and are not repeated here; 11 additional citations follow.

Research last verified 2026-07-27.

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11. RealOEM — partxrefOpen source