- "It's the colour of my Nan's piss."
- ―Jay Cartwright
After passing his driving test, Simon's parents buy him a Fiat Cinquecento (Hawaii edition). Simon takes an instant dislike to the car particularly because of its colour and the fact that it has a 'tape-deck'. The car is further mocked by Andrew Cooper, Will, Jay, Polly McKenzie and Mark Donovan.
On the same day he gets the car, Simon reluctantly takes Jay and Will on a road trip to Thorpe Park. Upon arrival an impatient Jay opens the passenger door too soon and breaks it off on a passing lamp post. In the knowledge that Neil's sister's boyfriend is a mechanic who will be able to fix it, the boys look for Neil but have no option but to carry the door around with them. It turns out that the boyfriend is a cashier in a BP garage and cannot fix it. The door is later replaced with a red one. Furthermore the car is further damaged that day after it is vandalised by some disabled boys Will insulted whilst boarding the "Nemesis Inferno".
Alongside 'Thorpe Park' the car features in other episodes. In 'Caravan Club', Neil and a punk girl give each other hand relief in the car, which is later revealed to everyone's disgust by Neil after the boys wonder why their seats are wet. In Will's Dilemma' Jay and Neil stick a bumper sticker which reads "Honk if you want a Blow-Job" to the back of the car. This is only revealed to Simon when his girlfriend Tara's uptight and prudish father sees it and berates him for it. In the following episode 'Trip to Warwick' the boys are forced to spend the night in the car after being evicted from Tara's sisters house; Simon for scaring Tara by slapping and shouting at his flacid penis, Jay for trying to have a three-some with Sophie and Heike (her girlfriend) and Will and Neil after the latter gets drunk and wets the bed. The car makes its last appearance in the series 3 episode Camping Trip, the show's finale. After the news that Simon may have to move to Swansea, Will arranges a camping trip for them and the other boys as a last outing. After night falls, Jay moves the car so that they can use its headlights to properly see their Monopoly game. Unfortunately, he forgets to put the hand-brake on and the car begins to roll down a hill towards a nearby lake. As Simon and Will try to get in (Jay believing he left the keys inside, whilst all along they were in his pocket), Neil and Jay decide that it is inevitable that the car will end up in the lake and let it do so. Simon is furious at first, particularly after Neil throws a stone through the back window. Later on however he has comes to terms with the loss the car, which he never liked anyway. As the boys leave the campsite, the car remains half submerged in the lake, with its headlights still on.
- The Fiat Cinquecento is a real make of car, which was produced between 1991 and 1998, the Hawaii edition however is fictional.
- The Cinquecento has a mileage of 175,593 as displayed when Simon attempts to travel at 100mph in the 'Caravan Club' episode.
- The Rudge Park Yearbook features an advertisment where Alan Cooper attempts to sell the car for £250 or a close price. He does not acknowledge the damage and tries to market the flaws such as saying that the seats "have been slightly moistened using a special kind of lake water" to prevent engine fires spreading and refers to the tape deck as 'retro style'. A "vanilla yoghurt" stain on the back seat is also acknowledged.
- The only people to explicitly say they like the car are Pamela Cooper (although it is likely she was just trying to be supportive) and Tara, who likes the car, claiming that "it is so tragic at least I know he is not out picking up girls in it".
- In 2011 the Fiat which featured in the series was put up for sale on eBay for Comic Relief.
- Alan refers to it as the 'Yellow Peril'.