How to easily fix Nissan Qashqai p1641 fault with engine hard to start issue engine light on

This video shows the steps of diagnosing the fault code p1641 on Nissan Qashqai. engine hard to start, engine warning light comes on can occur Due to this fault.
I have replaced the main fusible link purchased from Nissan dealer and also Thermo plunger relay.
Replace the wiring harness connector purchased from a car wrecker. due to the connector can't purchased separately from Nissan. the harness connector come with full engine harness and its worth over $2500 AUD.
Erased stored fault codes once completed the job.