Denso 234-4088 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for BMW 325i and 528e Models

The Denso OE Style Oxygen Sensor 234-4088 is designed specifically for select BMW vehicles, including the 325i, 325is, 325iX, and 528e. This heated oxygen sensor ensures accurate emissions monitoring and optimal engine performance by providing precise air-fuel mixture data to your vehicle's engine control unit.

• Heated sensor type for faster response times
• Specific fit for BMW 325i, 325is, 325iX, and 528e models
• Threaded mounting type with 0.708-inch thread diameter
• Four-wire design with female connector for secure connection
• Wiring harness length of 25.51 inches for proper installation

About the Denso OE Style Product Line

The OE Style line from Denso offers direct replacement parts engineered to meet original equipment specifications. This oxygen sensor maintains the quality and fitment standards expected from factory components, ensuring compatibility and reliable performance for your BMW 325i or 528e. The OE Style designation indicates a focus on precise fit and function without modification.

Detailed Product Description

The Denso 234-4088 oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving emissions control and fuel efficiency. Its four-wire configuration supports both the sensor signal and heater circuit, while the female connector ensures a secure and corrosion-resistant connection. The threaded mounting type with a 0.708-inch diameter allows for straightforward installation in the designated exhaust port. With a wiring harness length of 25.51 inches, this sensor provides adequate reach for proper routing in the engine bay.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for BMW 325i and 528e models
• Helps resolve rough idling and poor engine performance
• Reduces emissions-related trouble codes and check engine light triggers
• Improves fuel economy by optimizing combustion efficiency
• Prevents failed emissions tests due to faulty oxygen sensor readings

Installation Notes and Tips

Ensure the vehicle is cool before removing the old oxygen sensor to avoid burns. Use an oxygen sensor socket or appropriate wrench to remove and install the sensor. Verify the connector gender matches the vehicle harness for a proper fit. Avoid damaging the wiring harness during installation and route the wires away from hot exhaust components. Torque the sensor to manufacturer specifications to prevent leaks.

Quality Assurance and Warranty

Denso OE Style oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. While specific warranty details are not provided here, Denso products typically come with a limited warranty covering defects in materials and workmanship. Refer to the product packaging or manufacturer documentation for exact warranty terms.