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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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Front Oxygen Sensor Set - E9x, E82, E88, Z4
Front Oxygen Sensor Set - E9x, E82, E88, Z4
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:55317713
Part#: BFR1/2O2SKT2
In Stock
New Item
Sale - Save 19% $ 400.99

This product was last offered at the strikethrough price on
07-14-2026

$ 325.67 USD
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Sale - Save 19%
$ 400.99

This product was last offered at the strikethrough price on
07-14-2026

$ 325.67 USD
Free Shipping on orders $49 and up
Add to Wish List
Over time, that degradation robs your BMW of its crisp throttle response, tanks your fuel economy, and leaves you staring at a failed emissions ticket
Bosch Oxygen Sensors - Bank 1 And 2 Pre-Cat - N52
Bosch Oxygen Sensors - Bank 1 And 2 Pre-Cat - N52
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:56110313
Part#: 11787558055KT
In Stock
New Item
Sale - Save 6% $ 307.99

This product was last offered at the strikethrough price on
08-13-2026

$ 289.50 USD
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Sale - Save 6%
$ 307.99

This product was last offered at the strikethrough price on
08-13-2026

$ 289.50 USD
Free Shipping on orders $49 and up
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Your engine's air fuel ratio needs to be dead on. Worn out factory pre-cat oxygen sensors delay vital data to the DME, leading to sub optimal fueling, lost horsepower, and dangerous hesitation under load.
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Rear Oxygen Sensor Set - N52, N54
Rear Oxygen Sensor Set - N52, N54
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:55353594
Part#: 11787545074/5KT2
In Stock
New Item
Sale - Save 3% $ 366.99

This product was last offered at the strikethrough price on
10-28-2026

$ 355.63 USD
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Sale - Save 3%
$ 366.99

This product was last offered at the strikethrough price on
10-28-2026

$ 355.63 USD
Free Shipping on orders $49 and up
Add to Wish List
Sluggish oxygen sensors do a lot more than just light up your dashboard with an annoying Check Engine Light—they directly choke your BMW’s performance.
Bosch Oxygen Sensor Set - Pre and Post Catalytic Converter - N55
Bosch Oxygen Sensor Set - Pre and Post Catalytic Converter - N55 ...
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:55857772
Part#: 11787589475KT2
In Stock
New Item
$ 342.99 USD
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$ 342.99 USD
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Extreme exhaust heat and carbon buildup degrade your factory oxygen sensors over time, sending lazy data to your DME and robbing you of performance.
O2 Sensor Bung and Plug
O2 Sensor Bung and Plug
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:339000
Part#: TEN9949O2S
Ships in 6 Business Days
Starting at $ 12.95 USD
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Starting at $ 12.95 USD
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This weld-in bung allows an O2 sensor to be screwed into your exhaust system. It's required for custom exhaust systems, and is also useful for air/fuel ratio measurements when dyno testing.

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