[seelsa73]

The mechanic i went to says that i need a new O2 sensor for my 2004 elantra, but that it can only come straight from hyundai at $400. But when i search on advanceautoparts.com i get an exact fit sensor for $64. Who's right, the mechanic or advance auto?

 

[hyundaipwr]

Both are right, it's just that sometimes sensors from aftermarket companies are crazyy cheap.

If it seems legit and specifically for your Elantra then go ahead!