If you mean the MAF sensor, just Google it. There are bunches of sources out there. These sensors last a very long time if you spray them ONLY with MAF sensor cleaner and don't touch them or bump them. They are very sensitive. Also, if you have a K&N type of air filter, do not apply too much oil on it because it can coat the sensor elements.Is there anywhere you can buy a maf insert for a 2.5?