Post-Cat Oxygen Sensor, Bosch - E46, E39, X3, X5, Z3, Z4 - 11781433940
E46 325/330: Up to 2/2003 production. OEM Bosch bank 1 or 2 post-cat O2 sensor. 24 month warranty.
E46 non-M, E39 525i/528i/530i, E83 X3 2.5i/3.0i, E53 X5 3.0, Z3 2.5i/2.8i/3.0i, E85 Z4 2.5i/3.0i bank 1 post-cat O2 sensor (cylinder 1-3, after the catalytic converter).
E46 fitment note: up to 2/2003 production ONLY. If your E46 3 series was bult after February of 2003, this O2 sensor is not the one you will need. For cars built before February of 2003 (earlier cars) this is the correct sensor (this applies to E46 325/330 models only).
This the oxygen sensor (O2 or Lambda probe) located after the catalytic converter. It reads and checks the status of the exhaust after going through the catalytic converter. The engine computer uses this data to verify the cats are working properly. A failed O2 sensor can set several different types of fault codes so it's a good place to start if you have O2 sensor or heater circuit faults. Most cat manufacturers will insist that you have new post-cat O2 sensors when you install new cats. This is a new OEM O2 sensor from Bosch, the inventors of the system and the original supplier to BMW.
E46 (99-05) > 320i
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
E39 (97-03) > 525i
E39 (97-03) > 528i
E39 (97-03) > 530i
E83 X3 (04-10) > X3 2.5i M54 (2003-2005)
E83 X3 (04-10) > X3 3.0i M54 (2003-2006)
E53 X5 (00-06) > X5 3.0i M54
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8
E36/7 / E36/8 Z3 (96-02) > Z3 3.0