HomeEmission Control > SensorsWalker 350-34584 Oxygen Sensor - Upstream, Upstream Left or Upstream Right
Part #: 350-34584

Walker 350-34584 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker Products Aftermarket, Upstream Left
20 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$62.27Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Walker Products Aftermarket, Upstream Left
Fitment: BMW, 850CSi, 325i, 325is, and 325iX
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Walker Oxygen Sensor 350-34584

The Walker 350-34584 oxygen sensor is designed specifically for select BMW models, including the 325i, 325is, 325iX, and 850CSi. This heated oxygen sensor features a threaded mounting type and a radiused polygon female connector, ensuring precise fitment and reliable performance.

  • Heated oxygen sensor for accurate emissions control
  • Specific fit for BMW 325i, 325is, 325iX, and 850CSi models
  • 22.36-inch wiring harness length with 4 wires of 20 gauge
  • Threaded mounting with 18.0 mm thread diameter
  • Radiused polygon female connector for secure connection
  • Overall length of 25.91 inches for proper installation

Walker Products Aftermarket Line Details

This oxygen sensor is part of the Walker Products Aftermarket line, which focuses on providing reliable emission control components tailored to specific vehicle applications. The product line emphasizes precise fitment and quality construction, supporting emission system efficiency and compliance for vehicles like the BMW 325i and 850CSi.

Technical Description and Attributes

The Walker 350-34584 oxygen sensor is a heated sensor type, which helps reduce warm-up time and improves sensor responsiveness. It includes a 22.36-inch wiring harness with four 20-gauge wires, allowing for stable electrical signals. The sensor’s radiused polygon female connector ensures a secure and correct connection to the vehicle’s wiring harness. The threaded mounting type with an 18.0 mm diameter provides a firm and leak-free installation. With an overall length of 25.91 inches, this sensor fits precisely in the designated location on compatible BMW models.

Common Applications and Problem Resolution

  • Restores accurate oxygen level readings for optimal fuel mixture
  • Helps resolve check engine light issues related to oxygen sensors
  • Improves emissions system performance and reduces exhaust pollutants
  • Addresses poor fuel economy caused by faulty sensor signals
  • Prevents engine hesitation and rough idling linked to sensor failure

Installation Notes and Tips

When installing the Walker 350-34584 oxygen sensor, ensure the threaded mounting hole is clean and free of debris. Use anti-seize compound on the threads if recommended by the vehicle manufacturer. Connect the radiused polygon female connector firmly to avoid electrical issues. Verify the wiring harness length and routing to prevent damage or interference with moving parts. Proper torque specifications should be followed to avoid sensor damage.

Quality Assurance and Warranty

Walker Products Aftermarket oxygen sensors are manufactured to meet or exceed OEM specifications for fit, form, and function. This sensor undergoes rigorous testing to ensure durability and reliable performance in emission control systems. Warranty coverage details should be confirmed with the product documentation or supplier.

BrandWalker
Part Number350-34584
PositionWalker Products Aftermarket, Upstream Left
Connector GenderFemale
Connector ShapeRadiused Polygon
Mounting TypeThreaded
Overall Length25.91
Sensor TypeHeated
Thread Diameter18.0
Universal Or Specific FitSpecific
Wire Gauge Measurement20
Wire Quantity4
Wiring Harness Length22.36

This part fits 20 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
1995BMW850CSi5.6LV12GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products Aftermarket
1995BMW850CSi5.6LV12GASUpstream LeftInstall upstream oxygen sensor on the left side.; Walker Products Aftermarket
1994BMW850CSi5.6LV12GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products Aftermarket
1994BMW850CSi5.6LV12GASUpstream LeftInstall upstream oxygen sensor on the left side.; Walker Products Aftermarket
1991BMW325i2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1991BMW325is2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1991BMW325iX2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1990BMW325i2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1990BMW325is2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1990BMW325iX2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1989BMW325i2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1989BMW325is2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1989BMW325iX2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket
1988BMW325i2.5LL6GASUpstreamFrom 9/87; Del 9/87; Upstream; Walker Products Aftermarket
1988BMW325i2.5LL6GASUpstreamFrom 9/87; Upstream; Walker Products Aftermarket
1988BMW325is2.5LL6GASUpstreamFrom 9/87; Del 9/87; Upstream; Walker Products Aftermarket
1988BMW325is2.5LL6GASUpstreamFrom 9/87; Upstream; Walker Products Aftermarket
1988BMW325iX2.5LL6GASUpstreamFrom 9/87; Del 9/87; Upstream; Walker Products Aftermarket
1988BMW325iX2.5LL6GASUpstreamFrom 9/87; Upstream; Walker Products Aftermarket
1987BMW325i2.5LL6GASUpstreamInstall upstream oxygen sensor for optimal performance.; Walker Products Aftermarket

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.