Delphi ES20355 Oxygen Sensor - Front or Rear

Delphi ES20355 Oxygen Sensor Overview

The Delphi ES20355 is a heated oxygen sensor built for front-position applications where accurate exhaust feedback is critical. With OE heritage behind the design, this sensor supports precise air-fuel monitoring for vehicles such as the Chevrolet Colorado, GMC Canyon, and Saab 9-5.

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design with triangle connector shape
• 18 x 1.5 mm thread size for direct exhaust mounting
• 500.0 overall length for application-specific routing
• Front position sensor
• Package contents: oxygen sensor and instruction sheet

OE-Style Emissions Control Performance

Delphi ES20355 is engineered from more than a century of OE experience and supplier knowledge used by major automakers. This oxygen sensor helps maintain proper exhaust monitoring on front sensor locations across select Buick, Chevrolet, GMC, Hummer, Cadillac, Saab, and Isuzu applications. It cross-references Bosch 15131 for the same application.

Vehicle Fitment

• Fits 2006-2012 Chevrolet Colorado, front
• Fits 2006-2012 GMC Canyon, front
• Fits 2011 Saab 9-5, front
• Fits 2006-2010 Hummer H3, front
• Fits 2009-2010 Hummer H3T, front
• Fits 2006-2009 Cadillac STS, front
• Fits 2006-2009 Chevrolet Trailblazer, front
• Fits 2006-2009 GMC Envoy, front
• Fits 2006-2009 Saab 9-7x, front
• Fits 2006-2008 Isuzu Ascender, front
• Fits 2007-2008 Isuzu i-290, front
• Fits 2007-2008 Isuzu i-370, front
• Fits 2006-2007 Buick Rainier, front
• Fits 2006 Chevrolet Trailblazer EXT, front
• Fits 2006 GMC Envoy XL, front
• Fits 2006 Isuzu i-280, front
• Fits 2006 Isuzu i-350, front
• Fits 2011 Buick Regal, rear, 2nd Design; with Female Connector
• Fits 2011 Buick Regal, rear
• Fits 2011-2016 Buick LaCrosse, rear
• Fits 2012-2017 Buick Regal, rear
• Fits 2013-2014 Chevrolet Malibu, rear
• Fits 2014 Chevrolet Impala, rear

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a failing front sensor
• Rough idle or drivability concerns caused by inaccurate exhaust feedback
• Emissions test failures tied to sensor response issues
• Slow sensor warm-up on heated oxygen sensor circuits

Installation Notes and Tips

Verify connector shape, wire count, thread size, and sensor position before installation. This Delphi ES20355 uses a triangle connector and 4-wire configuration, so it should be matched carefully to the original sensor on the vehicle. Confirm the application by year, make, model, and front or rear location before replacing the part.

Quality Assurance

Delphi builds this oxygen sensor using OE-based engineering knowledge developed through long-term supplier experience with top automakers. The result is a replacement part focused on accurate fitment, proper electrical connection, and emissions-system serviceability for the listed applications.