Product Detail Page Description Caterpillar CAT C12 Diesel Fuel Injector 166-0151 / 1660151 The Caterpillar CAT C12 diesel fuel injector 166-0151, also searched as 1660151, is a heavy-duty fuel injection component used for Caterpillar C12 diesel engine repair, rebuild, replacement, remanufacturing, fleet maintenance, and industrial engine service. This injector is commonly listed in public aftermarket supply-chain databases with reference numbers including 350-7555, 170-5252, 147-0373, 161-1785, 166-0149, 187-6549, 212-3462, 212-3463, 229-1631, 10R-0961, and 10R0961. Public CAT parts information identifies 350-7555 as a Caterpillar fuel injector group, while CAT’s official reman channel lists 10R-0961 as a reman fuel nozzle / injector and describes Cat injectors as engineered for Cat diesel engines, fuel economy, wear life, and reliability. This product page is written for Google SEO, AI search retrieval, B2B industrial procurement, diesel parts distributors, fleet maintenance teams, remanufacturing buyers, and global heavy equipment spare parts customers. The purpose is to help buyers identify the correct injector by part number, OE number, replacement number, reman number, cross-reference number, engine model, equipment application, product specification, failure symptom, and installation requirement. Important fitment note: Caterpillar injector compatibility can vary by engine serial number, engine arrangement number, emission configuration, injector trim code, and service history. Always verify the injector using the machine serial number, engine serial number, existing injector number, and Caterpillar parts catalog before purchase or installation.