"This was apparently deemed to be because of something to do with a velcro strap. Then, after we had made the unexpected landing, other passengers reported that the noises the person in row 26 had reported were actually a sign that there was a problem with the engine," the passenger said.
The plane was scheduled to board at 2pm and arrive in Dunedin at 4pm.
"We boarded at 7.50pm, arrived at 10.15pm."
Passenger Tony Robinson told Stuff.co.nz the flight turned around about 15 minutes in.
He said while the jet was ascending there were up to nine orange flashes, banging noises, and the aircraft was "jerking and shuddering".
Mr Robinson told Fairfax it felt like the plane had a handbrake on.After the aircraft had finished ascending, it turned around and headed back to Auckland Airport, he said.
Passengers were panicked and trying to call cabin crew for assistance, but no one came, he said.
But the passenger from the front of the craft said staff had done a good job.
"When we landed, the pilot came down the aisle and asked passengers whether we were okay. He and the crew received a round of applause.
"The two female flight attendants at the front of the plane remained calm, with absolutely no sign of trouble on their poker faces throughout the ordeal."
Bruce Hellyer said his daughter was on the flight.
"She said there was a lot of noise and vibration, and a strong smell of oil in the cabin.
"After landing, the captain announced that they had had an engine problem," he said.
Mr Hellyer said his daughter finally got a flight to Dunedin at 8.30pm - six hours after she was scheduled to leave - and was given $16 of meal vouchers while she was waiting.
A Jetstar spokesman said the company was still investigating the cause of the fault which occurred in one of the engines shortly after take-off.
He said the aircraft was designed to operate with one engine - and in this case flew with one engine on full power and one on reduced power.
"The captain elected to return to Auckland and had a normal landing. Customers were accommodated on later services."