P0340 Fault in 1999 Mustang Cobra 4.6L DOHC: Diagnosis and Troubleshooting Guide
Hello! I recently installed a new 4.6L DOHC engine in my wife's 1999 Mustang Cobra, but the vehicle is now displaying fault code P0340 — Camshaft Position Sensor Circuit Malfunction. I replaced the camshaft position sensor and inspected all wiring harnesses; no visible cuts or frays were found. Despite this, the code persists. I've heard reports that some 1999 Mustang GT owners had to replace their alternators when encountering the same P0340 code — but this seems unlikely given the specific nature of the fault. Could there be another underlying issue? Could you please advise on what other components or conditions I should investigate? For instance, is it possible that the sensor was transferred from the original engine, or could there be a wiring or timing-related problem? Thanks in advance for any insights!
Could you clarify whether the engine block is new or used? Is it a short-block or long-block rebuild? These details are critical to rule out common scenarios. Also, please confirm that the timing marks were properly aligned during installation.