1 Having a landscaper or other professional install outdoor French drains can cost $10-$30 a linear foot but averages about $25 /foot depending on depth and width (typically 12-24 deep and 6-18 wide), and local rates.2  A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250. A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250.
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And, on engines that do not have a Mass Air Flow (MAF) sensor, the MAP sensor signal is also used by the PCM to calculate engine load -- how hard the engine is working. This is called the speed-density method of calculating engine load for engines without MAF sensors. It is because of this engine load calculation for speed-density engines that the accuracy of the MAP sensor signal is so critical. On OBD-II engines, the MAP sensor signal is also used for EGR diagnosis.