The answer to this will depend on exactly which model Barina you have. In some models (typically earlier ones) the code is simply a servicing reminder to make sure the owner knows maintenance is due.

But in some versions of the Barina of this era, fault code 89 usually relates to a problem with the car’s thermostat. So don’t drive it any farther as the faulty thermostat could cause the engine to overheat with catastrophic results. Have a mechanic check things out and see if the thermostat is indeed faulty. If it is, it’s a relatively cheap fix, certainly compared with the cost of a new engine.

Sometimes the code relates to a switch in the thermostat that is responsible for switching on the car’s electric fans, but either way, it could lead to overheating. Don’t ignore it in any case.

The only real way to properly overcome a dashboard – or a 'check engine’ – warning light is to fix the problem that caused it to light up in the first place. Cars like yours have lots of sensors dotted around them to keep an eye on things like the emissions controls and a small glitch in one of these can cause the warning light to illuminate.

The best way forward is to have the car electronically scanned at a workshop equipped to do so. From there, the car can tell the mechanic what’s wrong and you can pinpoint the exact problem. Otherwise you’ll be stabbing in the dark, as these systems can be very complex and made up by lots of different sensors and triggers, all of which can give the same warning light.

Beyond that, a car’s oxygen sensor (which lives in the exhaust system and sniffs the engine’s emissions) is a likely culprit. But don’t guess: scan the car’s computer and find out for sure.

This generation of Holden engines was prone to failure of the crankcase ventilation valve (PCV). When it failed, it caused a vacuum leak in the engine that could easily cause rough running and hard starting. It would also possibly trigger a check-engine light.

Depending on the model and year of the car, you might be able to fit a replacement PCV, but sometimes the solution was to replace the entire rocker cover assembly, which included the valve in question. In many cases, the valve failure was accompanied by a failed rocker cover gasket that leaked oil on to the spark plugs, making the car run even more erratically. Don’t be tempted to try a second-hand PCV from a wrecked Barina. The chances are every high that it’s PCV will be trashed, too.