Mass Air Flow Sensor / Meter / MAF Fits: 2003-2006 BMW 330Ci, 330i, X3, Z4 In order to avoid return hassle and save yours and our time, you must cross-check indicated reference part numbers against those found on your old unit. Do not rely on vehicles compatibility list, which is presented for the reference purpose and shouldn't be your guide to determine compatibility. If you are unsure, you may call local dealership (auto parts dept.) to obtain correct part numbers or ask your mechanic. If you would like us to help you, please contact us and provide your vehicle's detailed info such as: Make/Model/Year/Engine/Full VIN# and we will do our best to find compatibility. PART REFERENCE NUMBERS: OEM: SIEMENS/VDO: 13627566983 13627513956 5WK9642 5WK9642Z AIRTEX/WELLS: CARDONE: 5S2990 SU6950 7410116 74-10116 HELLA: 8ET009142661 8ET009142-661 *Please cross-check indicated OEM reference codes against those found on your current unit. You may call local dealership (auto parts dept.) to obtain correct numbers. COMPATIBLE VEHICLES: * Models presented for reference purpose only! Year: Make: Model: BMW 330CI (2003 - 2006) BMW 330I (2003 - 2005) BMW X3 (2004 - 2006) BMW Z4 (2003 - 2005)