What does it mean when resetting the service light on a Volvo S60 and code 042 appears?

When resetting the service light on a Volvo S60, code 042 indicates a problem with the catalytic converter. The catalytic converter is a device that helps to reduce emissions from the vehicle's exhaust system. It does this by converting harmful pollutants, such as carbon monoxide and hydrocarbons, into less harmful substances, such as carbon dioxide and water.

If the catalytic converter is not working properly, it can lead to increased emissions and decreased performance. In some cases, it can also cause the engine to run rough or stall.

If you see code 042 when resetting the service light on your Volvo S60, it is important to have the vehicle inspected by a qualified technician as soon as possible. The technician will be able to diagnose the problem and recommend the appropriate repairs.

Here are some possible causes of code 042 on a Volvo S60:

- Faulty catalytic converter

- Faulty oxygen sensor

- Exhaust system leak

- Engine misfire

- Fuel injector problems

It is important to note that code 042 does not necessarily mean that the catalytic converter is bad. It could be caused by one of the other problems listed above. However, it is important to have the vehicle inspected to rule out any serious problems.