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Denso Products

Denso Air/Fuel Ratio Sensors

4.77 out of 5 stars 22 Customer Reviews

Denso air/fuel ratio sensors (A/F sensors) were developed to measure air-to-fuel ratios under a wider range of driving conditions than oxygen sensors. A/F sensors,
Denso air/fuel ratio sensors (A/F sensors) were developed to measure air-to-fuel ratios under a wider range of driving conditions than oxygen sensors. A/F sensors, also known as wide-band oxygen sensors, send information to the engine management computer to make adjustments based on driving conditions. Their wider range and variable adjustments allow engines to burn fuel more efficiently and produce fewer emissions.

As A/F sensor technology has evolved, Denso has been there every step of the way. From the first thimble-type sensors to today's heated, quick-response sensors required to meet ever more stringent emis
Denso air/fuel ratio sensors (A/F sensors) were developed to measure air-to-fuel ratios under a wider range of driving conditions than oxygen sensors. A/F sensors, also known as wide-band oxygen sensors, send information to the engine management computer to make adjustments based on driving conditions. Their wider range and variable adjustments allow engines to burn fuel more efficiently and produce fewer emissions.

As A/F sensor technology has evolved, Denso has been there every step of the way. From the first thimble-type sensors to today's heated, quick-response sensors required to meet ever more stringent emissions regulations, Denso has supplied OEMs with quality components and continues to innovate. Denso helped to develop this important technology and you can rely on Denso First Time Fit A/F sensors.

Features and benefits of Denso air/fuel ratio sensors include:

* Tarnish-proof platinum electrode provides longer life and maintains accuracy
* Quick-response planar zirconia element quickly detects oxygen concentration
* Measures air/fuel ratios from approximately 12:1 to 19:1
* Increased performance by mapping air/fuel ratios throughout the RPM range
* Lower emissions by optimizing the air/fuel mixture
* Reduces fuel consumption and maximizes catalytic converter life
* First Time Fit design delivers the right part the first time

Showing In Stock Items. Show All 24 Items.

Results 1 - 24 of 24

Denso Air/Fuel Ratio Sensors for 2010-2013 3 - 234-5042

Denso Air/Fuel Ratio Sensors for 2010-2013 3 - 234-5042

Denso Air/Fuel Ratio Sensors for 2010-2013 3 - 234-5042

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5042

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors 234-5113

Denso Air/Fuel Ratio Sensors 234-5113

Denso Air/Fuel Ratio Sensors 234-5113

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Ford, Lincoln, Mazda, Mercury, Each

Part Number: DNP-234-5113

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2011-2013 3 - 234-5078

Denso Air/Fuel Ratio Sensors for 2011-2013 3 - 234-5078

Denso Air/Fuel Ratio Sensors for 2011-2013 3 - 234-5078

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5078

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors 234-5038

Denso Air/Fuel Ratio Sensors 234-5038

Denso Air/Fuel Ratio Sensors 234-5038

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Ford, Lincoln, Mazda, Mercury, Each

Part Number: DNP-234-5038

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

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Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2004-2009 3 - 234-9085

Denso Air/Fuel Ratio Sensors for 2004-2009 3 - 234-9085

Denso Air/Fuel Ratio Sensors for 2004-2009 3 - 234-9085

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9085

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

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Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-9087

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-9087

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-9087

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9087

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors 234-5039

Denso Air/Fuel Ratio Sensors 234-5039

Denso Air/Fuel Ratio Sensors 234-5039

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Ford, Mazda, Mercury, Each

Part Number: DNP-234-5039

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2010-2012 CX-7 - 234-5043

Denso Air/Fuel Ratio Sensors for 2010-2012 CX-7 - 234-5043

Denso Air/Fuel Ratio Sensors for 2010-2012 CX-7 - 234-5043

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5043

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-5011

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-5011

Denso Air/Fuel Ratio Sensors for 2006-2008 6 - 234-5011

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5011

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2012-2013 3 - 234-5058

Denso Air/Fuel Ratio Sensors for 2012-2013 3 - 234-5058

Denso Air/Fuel Ratio Sensors for 2012-2013 3 - 234-5058

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5058

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2012 3 - 234-5063

Denso Air/Fuel Ratio Sensors for 2012 3 - 234-5063

Denso Air/Fuel Ratio Sensors for 2012 3 - 234-5063

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5063

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2004-2008 RX-8 - 234-9102

Denso Air/Fuel Ratio Sensors for 2004-2008 RX-8 - 234-9102

Denso Air/Fuel Ratio Sensors for 2004-2008 RX-8 - 234-9102

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9102

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 9, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2014-2018 3, 2014-2017 6, 2013-2018 CX-5 - 234-5059

Denso Air/Fuel Ratio Sensors for 2014-2018 3, 2014-2017 6, 2013-2018 CX-5 - 234-5059

Denso Air/Fuel Ratio Sensors for 2014-2018 3, 2014-2017 6, 2013-2018 CX-5 - 234-5059

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5059

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2010 3 - 234-5041

Denso Air/Fuel Ratio Sensors for 2010 3 - 234-5041

Denso Air/Fuel Ratio Sensors for 2010 3 - 234-5041

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5041

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2013-2015 5 - 234-5077

Denso Air/Fuel Ratio Sensors for 2013-2015 5 - 234-5077

Denso Air/Fuel Ratio Sensors for 2013-2015 5 - 234-5077

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5077

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2011-2014 2 - 234-9103

Denso Air/Fuel Ratio Sensors for 2011-2014 2 - 234-9103

Denso Air/Fuel Ratio Sensors for 2011-2014 2 - 234-9103

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9103

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2007-2012 CX-7 - 234-5012

Denso Air/Fuel Ratio Sensors for 2007-2012 CX-7 - 234-5012

Denso Air/Fuel Ratio Sensors for 2007-2012 CX-7 - 234-5012

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5012

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2006-2007 6 - 234-5014

Denso Air/Fuel Ratio Sensors for 2006-2007 6 - 234-5014

Denso Air/Fuel Ratio Sensors for 2006-2007 6 - 234-5014

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5014

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2006-2011 3, 2008-2010 5 - 234-5040

Denso Air/Fuel Ratio Sensors for 2006-2011 3, 2008-2010 5 - 234-5040

Denso Air/Fuel Ratio Sensors for 2006-2011 3, 2008-2010 5 - 234-5040

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5040

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2009-2013 6 - 234-5033

Denso Air/Fuel Ratio Sensors for 2009-2013 6 - 234-5033

Denso Air/Fuel Ratio Sensors for 2009-2013 6 - 234-5033

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-5033

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2009-2011 RX-8 - 234-9059

Denso Air/Fuel Ratio Sensors for 2009-2011 RX-8 - 234-9059

Denso Air/Fuel Ratio Sensors for 2009-2011 RX-8 - 234-9059

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9059

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2009-2015 MX-5 MIATA - 234-9093

Denso Air/Fuel Ratio Sensors for 2009-2015 MX-5 MIATA - 234-9093

Denso Air/Fuel Ratio Sensors for 2009-2015 MX-5 MIATA - 234-9093

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9093

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2005 6 - 234-9086

Denso Air/Fuel Ratio Sensors for 2005 6 - 234-9086

Denso Air/Fuel Ratio Sensors for 2005 6 - 234-9086

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9086

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

Denso Air/Fuel Ratio Sensors for 2006-2008 MX-5 MIATA - 234-9088

Denso Air/Fuel Ratio Sensors for 2006-2008 MX-5 MIATA - 234-9088

Denso Air/Fuel Ratio Sensors for 2006-2008 MX-5 MIATA - 234-9088

Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Mazda, Each

Part Number: DNP-234-9088

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 12, 2026 if ordered today

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