With CARDONE Mass Air Flow Sensors (MAFS), you can expect smooth vehicle performance. Mass Air Flow Sensor. Warranty Duration. Obviously, the core won't be working well (or you wouldn't have replaced it) but it can't be smashed, rusted solid, or otherwise unusable.
Worked for 2 days then Service Engine Soon Light came on
I bought one for my son's 06 BMW X5 E53 M54 as a backup. Decided to install it for a week to make sure it was in working condition. It lasted 2 days and my son only drives about 28 miles per day. Read the codes after Service Engine Soon light came on and Mass Air Flow Hot Film was stored. Cleared code and reinstalled original and no codes and no service engine soon light. Glad I tried it while I still had a working unit to compare it to.
I would not recommend this unit.