Post-Cat Oxygen Sensor, Bosch - E46, E39, X3, X5, Z3, Z4

OEM Bosch bank 1 or 2 post-cat O2 sensor replaces BMW part #11781433940

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Price:
$78.48

E46 323i/325i/328i/330i*, E39 525i/528i/530i, E53 X5 3.0, Z3 2.5i/2.8i/3.0i, E85 Z4 2.5i/3.0i post-cat O2 sensor (banks 1 or 2**) (post-cat = after the catalytic converter).

* E46 325i/330i fitment note: up to 2/2003 production ONLY. If your 325i/330i was built after February of 2003, this O2 sensor is not the correct sensor. Does not apply to 325xi/330xi AWD models.
** E85 Z4 is the bank 1 post-cat sensor only. Bank 2 is a different part number (#11787513963). In all other models this sensor is used in both pipes.

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 an OEM oxygen sensor manufactured by Bosch - the original supplier to BMW for this part, as well as many other sensors. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty. 



BMW Fitments:
3 Series
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
5 Series
E39 (97-03) > 525i
E39 (97-03) > 528i 99-00
E39 (97-03) > 530i
X5 Series
E53 X5 (00-06) > X5 3.0i M54
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00
E36/7 / E36/8 Z3 (96-02) > Z3 3.0
Z Series
E85 / E86 Z4 (03-08) > Z4 2.5i M54
E85 / E86 Z4 (03-08) > Z4 3.0i M54
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