Delphi ES20373 Oxygen Sensor - Rear

Delphi ES20373 Rear Oxygen Sensor

The Delphi ES20373 is a heated rear oxygen sensor built for precise exhaust monitoring on select Suzuki applications. It draws on Delphi’s OE heritage and decades of supplier experience to deliver the fit and signal characteristics expected in modern emission control systems.

Key Features

• Heated oxygen sensor for faster operating temperature and stable feedback
• 4-wire design for signal and heater circuit operation
• Square connector shape for direct-style electrical connection
• 18 x 1.5 mm thread size for the specified exhaust bung
• 525.0 overall length for application-specific routing
• Rear position sensor for downstream exhaust monitoring
• Package contents include the oxygen sensor and instruction sheet

Detailed Description

Delphi ES20373 is an emission control oxygen sensor engineered for rear placement on 1999-2002 Suzuki Esteem and 2006-2008 Suzuki Grand Vitara. As a heated rear O2 sensor, it helps monitor exhaust oxygen content after the catalytic converter so the engine control system can evaluate catalyst performance and maintain proper fuel management. This part cross-references Bosch 15798 and DENSO Auto Parts 234-4225 for the same application.

Built with Delphi’s OE experience, this sensor is intended for drivers and repair shops replacing a worn or failed downstream sensor on Suzuki Grand Vitara or Suzuki Esteem models. The ES20373 part number is also a useful reference when verifying the correct rear oxygen sensor for these vehicles.

What It Helps Address

• Check engine light related to rear oxygen sensor performance
• Incorrect catalyst efficiency readings
• Rich or lean fuel trim issues caused by inaccurate exhaust feedback
• Slow sensor response from an aging heated O2 sensor
• Emission test failures tied to downstream sensor faults

Installation Notes and Tips

Fits 2006-2008 Suzuki Grand Vitara, rear. Fits 1999-2002 Suzuki Esteem, rear. Confirm the connector shape, 4-wire configuration, thread size, and overall length before installation. Inspect the exhaust bung threads and wiring route for damage, and compare the removed sensor to Delphi ES20373 to verify the rear position and connector match.

Quality Assurance

Delphi builds aftermarket parts using knowledge developed through long-term OE supply experience with major automakers. That OE background informs the design and manufacturing approach behind ES20373 for consistent fit and function in the specified Suzuki applications.