My Opcom diagnostic tool pinpointed a fault with the MAP on my wifes Astra td, got number off the sensor and reserched in google, found what I wanted on Amazon, an original bosch part at a reasonable price and purchased it, very fast delivery, fitted in moments, problem solved. have used many pattern parts over the years in an attempt to save money but have found the pattern parts, typically made in china, to be substandard, and without longeverty, much better to find original parts new or working secondhand.