Part Number Guides
How Honda and Toyota part numbers are structured — chassis codes, unit numbers, and the 23209 injector series. Written from the sourcing side.
Toyota 23209 Fuel Injector: OEM Part Number Supersessions Explained
How to tell an official Toyota replacement number from a cross-reference, and what to verify before quoting an older 23209-series injector number.
06161-59B-305 vs 16790-59B-003: What's the Difference?
Why Honda superseded 16790-59B-003 with 06161-59B-305: what changed, what did not, and what to verify before ordering the newer service part.
Honda GDI HPFP Part Numbers: 5PC vs 5LA, 0726 vs 0054
What the two Honda chassis codes mean, how they map to the two manufacturing unit numbers, and why both appear on invoices across the 1.5T and 2.4L families.
Toyota Fuel Injector Part Numbers: 23209 Series Reference
The 23209 prefix, the suffixes that change between versions, and how we keep them straight across the three numbers we stock.