Metropolitan Police officers say they are now seeking to speak to the unidentified male, who was captured on CCTV cameras close to the scene of the crash, which occurred on Friday (26 January) on Shepiston Lane, Hayes, at approximately 8:40pm.
It is understood the three boys had been on their way to a birthday party at a nearby football club with friends when they were killed.
The victims of the crash in Shepiston Lane are believed to be about 16 years old.
Emergency services raced to the horror on the M4 Junction 4, near an Esso petrol station, but tragically couldn't be saved and they were pronounced dead at the scene.
Meanwhile the suspected driver was taken to a west London hospital for treatment and subsequently transferred to a north London police station where he remains in custody.
"At least two males are believed to have left the black Audi A5 following the collision".
Despite the efforts of police and ambulance crews, all three boys died at the scene.
The Met said in a statement: 'Enquiries are ongoing to establish the full circumstances of the collision and the number of occupants in the vehicle involved'.
Detectives investigating an "horrific" road collision in London that resulted in the death of three teenagers have released an image of a man who may be linked to the incident.
One cashier said the police had come to inspect CCTV footage of the brawl, but said he did not know if it was related to the crash. He will be taken into custody once he is discharged. One of them was detained by members of the public, police said.
Heartbroken family members have left floral tributes at the scene to their "darling baby boy".
"I wasn't going to stop here, but I had to in the end", he said.
Another said: "I thought I would never have to write this and I don't know what to write but I will always love and miss you millions".
He said the Asian man seemed heavily intoxicated, adding: 'We saw two white boys and they were attacking an Asian man.
"I'm really cut up". It's a speed trap.
Detective Sergeant Michael Rapp of the Met's Serious Collision Investigation Unit said: "I would like to thank the media and public for their assistance with this appeal". Around 100 distraught family and friends arrived at the scene.