Open the toner door on your printer and check the sticker/label on the installed cartridge for its model number (e.g., "HP 151A" or "HP 151X") — many models also show supplies information in the on-screen menu. This matters here in particular: the HP LaserJet Pro 4001, 4002, 4003 and 4004 series (and their MFP 4101-4104 siblings) look almost identical but each generation takes a different cartridge — 4001/4101 use HP 148A/148X, 4002/4102 use HP 149A/149X, 4003/4103 use HP 151A/151X, and 4004/4104 use HP 152A/152X. Confirm your exact model number before ordering.

The HP 151A works with the HP LaserJet Pro 4003n, 4003dn and 4003dw, and the HP LaserJet Pro MFP 4103dw, MFP 4103fdn and MFP 4103fdw. It is not compatible with the 4001, 4002 or 4004 series (or their 4101/4102/4104 MFP equivalents) — those use a different HP cartridge.

Yield is stated per ISO/IEC 19752, the industry-standard test method for monochrome laser toner. Actual yield varies with print content and usage.

Yes — this is a 100% original HP 151A cartridge with JetIntelligence, sourced through official HP channels. It is not a compatible or remanufactured alternative.

If you print high volumes regularly, the HP 151X high-capacity cartridge reduces how often you need to replace toner and lowers your cost per page compared to the standard HP 151A.

Yes — HP 151A and HP 151X are fully interchangeable in the same compatible printers; the difference is page yield and cost per page, not fit.