A Hawaiian Airlines Airbus A321-200N, performing flight from San Diego to Kahului (USA) with 178 passengers and 7 crew, faced engine problem.

Aircraft was enroute at FL310 about 220nm west of San Diego when the crew decided to return to continental USA due to an indication of an engine problem. The aircraft descended to FL300 and diverted to Oakland (USA) for a safe landing about 100 minutes after departure.

The airline reported the aircraft diverted to Oakland as a precaution following indication of a possible engine problem.