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Overview
With dynamic design, high quality and class-leading safety, the Volvo S40 saloon is a true Volvo and one that asserts a unique identity in the growing premium compact class. Boasting a four-door ...

Operation
Press to operate the air quality sensor (normal setting). or: Select one of the following three functions by pressing 1, 2 or 3 times. 1. The AUT LED lights. The air quality sensor is now acti ...

Three-way catalytic converter
• Keep your engine properly tuned. Certain engine malfunctions, particularly involving the electrical, fuel or distributor ignition systems, may cause unusually high threeway catalytic convert ...