The Volvo S40 MAP Sensor feeds the engine computer with real-time intake pressure values, and this enables it to preplan the optimum fuel and spark timings, ensuring that the small saloon remains nimble on its hind wheels and that its fuel usage is also minimal. The MAP Sensor is a small, rugged device that attaches to the manifold, measures absolute as opposed to relative pressure, and combines the result with air temperature to come up with an accurate air density during each stroke of the piston. Such precision eliminates the bulky airflow meter on naturally aspirated S40 models, and turbo versions of the engine use the same device with a mass flow sensor to control boost, giving flexibility for the entire family. Its solid-state design has gained a status of reliability among Volvo owners, and the reliability is appreciated by all Volvo enthusiasts across the globe. Both generations have retained the same electrical connectors and mounting point, thus drivers can install a new one on a 1998 sedan or a 2012 T5 without any rewiring, and all S40s share this common hardware, which is hard to find in the sensor market today. The MAP Sensor also controls the timing of ignition, confirms EGR operation, and provides load data to stability control, and directly relates efficient combustion to the safety systems so beloved of the car. Later multibar versions have the capability to read pressure much greater than one atmosphere, ensuring proper mixtures in spirited turbo mode without modifying the ECU harness. The ability to be lightweight, fit with a plug, and have multiple bars attaching to it makes this small part very special, a continuation of the Volvo tradition of combining performance, economy, and occupant protection in a single intelligent package.
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