NTK
NTK Oxygen Sensor 21546
NTK Oxygen Sensor 21546
Part number: 3UL9E
Regular price
$71.05 USD
Regular price
Sale price
$71.05 USD
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- Ships direct from the brand or supplier
- Tracking emailed when it ships
- Free fitment check before you order
Oxygen Sensor 21546 from NTK. The part number and specifications are listed below. Reading the trouble code first points you to the right sensor.
Quick facts
- Brand: NTK
- Part type: Sensor
Listed fitment
- 2005 - 2009 Buick Allure CXL, CX
- 2005 - 2008 Buick Allure CXS
- 2008 - 2009 Buick Allure Super
- 2008 Buick Enclave CX, CXL
- 2005 - 2009 Buick LaCrosse CXL, CX
- 2005 - 2008 Buick LaCrosse CXS
- 2008 - 2009 Buick LaCrosse Super
- 2007 - 2011 Buick Lucerne CX, CXL
- 2010 Buick Lucerne CXL Special Edition
- 2007 - 2008 Buick Lucerne CXS
- 2008 - 2011 Buick Lucerne Super
- 2005 Buick Rainier CXL Plus, CXL
- 2006 - 2007 Buick Rendezvous CX, CXL
- 2005 - 2007 Buick Terraza CX, CXL
- 2012 Cadillac CTS 3.0L, 3.6L
- 2011 - 2014 Cadillac CTS Coupe
- 2010 - 2015 Cadillac CTS Performance
- 2009 - 2015 Cadillac CTS Premium, Base, Luxury, V
- 2013 Cadillac CTS V Luxury
- 2014 - 2015 Cadillac CTS Vsport Premium, Vsport
- 2004 - 2005 Cadillac DeVille Base, DTS, Protection Series, DHS
- 2003 - 2014 Cadillac Escalade Base
- 2009 - 2013 Cadillac Escalade Hybrid
- 2010 - 2013 Cadillac Escalade Hybrid Platinum
- 2008 - 2014 Cadillac Escalade Platinum
- 2011 - 2014 Cadillac Escalade Premium, Luxury
- 2012 Cadillac Escalade Special Edition
- 2008 - 2014 Cadillac Escalade ESV Base, Platinum
- 2011 - 2014 Cadillac Escalade ESV Luxury, Premium
- 2012 Cadillac Escalade ESV Special Edition
- 2008 - 2013 Cadillac Escalade EXT Base
- 2011 - 2013 Cadillac Escalade EXT Premium, Luxury
- 2004 Cadillac Seville SLS, STS
- 2008 - 2013 Chevrolet Avalanche Base
- 2013 Chevrolet Avalanche Black Diamond LS, Black Diamond LT, Black Diamond LTZ
- 2008 - 2012 Chevrolet Avalanche LTZ, LS, LT
- 2005 Chevrolet Avalanche 1500 LT, LS
- 2003 Chevrolet Avalanche 1500 On Road Edition, North Face, WBH
- 2004 - 2005 Chevrolet Avalanche 1500 Z66
- 2003 - 2005 Chevrolet Avalanche 1500 Z71, Base
- …and 112 more
Tip: Read the code, check the wiring and connector, and clear codes after the new sensor is in.
About this sensor
Reading the trouble code first points you to the right sensor.
Fitment notes
- Specs, lead time and warranty come from NTK and can change. The details above this guide are the latest we have.
Not sure it fits? Tell us exactly what you drive and we'll confirm fitment first. It's free and saves a return.
Ask about fitmentParts that usually go with it
- Connector and wiring. Corroded connectors mimic a bad sensor.
More for your car: Oxygen (O2) Sensors · Batteries & electrical
Questions about sensor
Will this fit my car?
Check the title and details above for the vehicles and part number it is listed for. If you are not sure, contact us with your year, make, model, engine and trim and we will confirm fitment before you order.
Will a new sensor clear my check-engine light?
If the sensor was the cause, the light usually goes off after codes are cleared or after a few drive cycles.
Where do specs and warranty details come from?
From NTK. Each brand sets its own specs, lead times and warranty terms, and they can change. The product details above are the latest we have.
Questions & answers
No questions yet about this part. Ask about fitment, what's in the box or installation and we'll answer here.
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