i need upstream sensors. the bentley ones go for $350.00. the bmw for the 4.4 liter about $100.00 are they compatible and/or is there an alternative which will fit? my mechanic says that generic ones will not due as they always cause the check engine light to go on.

 

I wouldn't bank on that. It is all about trial and error. Sometimes you win and sometimes you don't. I have heard the same stories before. I win most of the time...LoL. Of course, I would share it too. My Arnage is a 2003T and usually I am successful cross-referencing parts.