"Follow-up on the P2290 diagnostics: after installing a calibrated fuel temperature sensor and clearing fault memory, I logged a highway pull with the same conditions that triggered limp mode before. Rail pressure tracked the target curve (~165,000 kPa peak) and injector control pressure no longer dipped. Idle stabilized around 25,000 kPa and the ECM stayed fault-free through a 20 minute drive. The reconditioned HPFP and the budget LPFP continue to perform correctly when the ECU sees clean sensor data."