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Oxygen Sensors

Oxygen sensors constantly monitor engine emissions and relays this data to the DME. Using these readings the computer determines the proper air/fuel mixture as well as how efficiently the catalyst system is functioning. Symptoms of a failed oxygen sensor range from an EML to poor fuel economy and severe loss of power. A failed upstream sensor will typically cause the engine to run poorly and a failed downstream sensor will typically present as a catalyst efficiency code.

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OEM Bosch Oxygen Sensor - Cyl. 1-3 -before catalytic converter - E46 ...

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T#:3303

Part#: 11787523434

In Stock

Sale - Save 22% $ 210.65

This product was last offered at the strikethrough price on
05-02-2026

$ 165.00 USD

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Sale - Save 22%

$ 210.65

This product was last offered at the strikethrough price on
05-02-2026

$ 165.00 USD

Add to Wish List

This is the pre-cat oxygen sensor for bank 1 - cylinders 1-3 for BMW E46 E60 E83 X3 Bosch # 17 215.

This item fits the following BMWs:
3/2003-2005 E46 BMW 325i 325ci 325xi with M54 engine.
3/2003-2005 E46 BMW 330i 330ci 330xi
2004-2005 E60 BMW 525i 530i
2004-2006 E83 BMW X3 3.0i - Automatic Transmission Only

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