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Heated oxygen sensors
The heated oxygen sensors monitor the oxygen content of the exhaust gases. Readings are fed into a control module that continuously monitors engine functions and controls fuel injection. The ratio ...

Vehicle Overview
Volvo's smallest sedan, the compact S40, comes in 2.4i and T5 trim levels, the latter offered in all- as well as front-wheel drive. A few years past a full redesign, the S40 and its V50 wagon sist ...

Function check
All indicator and warning symbols light up in ignition mode II or when the engine is started. When the engine has started, all the symbols should go out except the parking brake symsymbol, which o ...