BMW 228i/320i/328i/428i/528i/X1/X3/X4/X5/Z4 F20/F30/F35 Upstream & Downstream Ox
$49.99
The upstream and downstream oxygen sensors monitor exhaust oxygen levels before and after the catalytic converter, letting the engine computer fine-tune fuel mixture and monitor emissions efficiency. Worn sensors typically cause reduced fuel economy, rough running, and a check engine light.
This sensor set (OE 11787589121/11787589122) fits the BMW F30 328i, F20, and F10 platforms with the 2.0L N20 turbo engine, and is shared across 228i, 320i, 428i, 528i, X1, X3, X4, and X5 models.
Built to OEM voltage and response specifications, this set restores precise fuel trim control and accurate catalytic converter monitoring.
Reference: OE/interchange WALKER
Quantity
New
Happy Humbl Customers
What they’re saying
"The socket set is top-tier quality. Heavy-duty steel that handles real torque without slipping. Better than the big box store brands honestly."
Jason M., Ohio
Ordered brake pads and rotors for my truck. Everything fit perfectly right out of the box. Saved me cash and shipping was surprisingly fast."
Isaac L., Texas
"Incredible service. Needed a specific sensor fast and it arrived a day early. The site is simple to use. Finally found a reliable parts source!"
Mike T., Florida
