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What does engine code 420 mean on a 2003 Ford Focus?

The engine code 420 on a 2003 Ford Focus indicates a problem with the catalytic converter. The catalytic converter is a device that helps to reduce emissions from the vehicle by converting harmful pollutants into less harmful substances. When the catalytic converter is not functioning properly, it can cause the vehicle to fail emissions tests and can also lead to decreased engine performance and fuel efficiency.

There are a few things that can cause the catalytic converter to fail, including:

- A lack of maintenance, such as not changing the oil regularly

- Using leaded gasoline

- Driving in extreme temperatures

- An engine problem that is causing the catalytic converter to overheat

If you see the engine code 420 on your Ford Focus, it is important to have the vehicle diagnosed and repaired as soon as possible. Driving with a faulty catalytic converter can damage your vehicle and can also be harmful to the environment.

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