View 5 Photos View 0 Videos 2018 Caterpillar C9.3 Diesel Engine Control Module ECM ECU 521-0791-02 $2,000 USD (GOOD USED) Caterpillar C9.3 OEM Diesel Engine Control Module, ECM, ECU, for sale!!!!!! Part #: 521-0791-02; Supersession Part #: 11R-1254; Stock #: E4704 For more information about this... ConditionUsedPart Number521-0791-02Stock NumberE4704 MLS Number14624802CategoryEngine Control Modules (ECM) Last Updated9/29/2026 LocationHialeah, FL, US Sold ByJJ Rebuilders Inc. (844) 385-___ SHOWNUMBERCall Seller Email Seller Save More Info