Delphi ES20156 Oxygen Sensor - Front, Rear, Rear Left or Rear Right

Delphi ES20156 Oxygen Sensor Overview

The Delphi ES20156 is a heated oxygen sensor built for emission control applications that require accurate exhaust feedback and OE-style fitment. With Delphi’s OE heritage and supplier experience behind it, this sensor is a direct replacement choice for select Lexus GS300 and Toyota applications.

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design with square connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 750.0
• Package contents: oxygen sensor and instruction sheet
• Position-specific fitment for front, rear, rear left, and rear right applications

Fitment Details

• Fits 1998-2005 Lexus GS300, front, cylinders 1 through 3.
• Fits 2001-2003 Toyota Highlander, rear, cylinders 1 through 4.
• Fits 2001-2003 Toyota RAV4, rear right.
• Fits 2001-2003 Toyota RAV4, rear left.

Why This Oxygen Sensor Matters

The Delphi ES20156 helps restore proper exhaust monitoring in vehicles that rely on a heated upstream or downstream oxygen sensor signal. For Lexus GS300 and Toyota Highlander or RAV4 applications, a worn sensor can affect fuel control and emissions performance; this replacement is built to match the required thread, connector, and wire configuration for the listed positions. This part cross-references DENSO Auto Parts 234-4048 for the same application.

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Emissions test failure caused by a degraded sensor
• Slow sensor response after warm-up

Installation Notes and Tips

Confirm the exact sensor position on your vehicle before ordering, since this part is listed for front, rear, rear left, and rear right locations depending on application. Verify connector shape, wire count, and thread size against the original sensor before installation. Use the vehicle application details to match the correct Lexus GS300 or Toyota fitment, and inspect the exhaust bung threads for damage before threading in the new sensor.

Quality Assurance

Delphi draws on more than a century of OE experience and knowledge gained from supplying major automakers. That OE background is reflected in the design and application matching of the ES20156 oxygen sensor.