I have one (it's the upper cover of the air filter box, isn't it?) from my CDN version 405 XU9J2 110 HP, if you're in a pinch. Located in Canada mind you!
If you can locate the sensor, it can be measured with a multimeter to check if it really is bad. The sensor is a thermistor and if you're lucky you can buy one from electronic parts suppliers and replace it without to much hassle. If you're really lucky yours is just dirty.