Denso Air Fuel Ratio Sensor 234-5010 — Wide‑Band O2 Sensor, 4‑Wire with 11.5‑inch Harness

The Denso 234-5010 is a direct-fit wide-band air/fuel ratio sensor engineered to restore accurate AFR readings and maintain efficient engine operation on compatible Acura, Honda and Saturn models.

This Denso sensor is built to original-equipment standards and replaces worn or failing sensors that can disrupt fuel trim, drivability and emissions. It uses a planar zirconia sensing element and platinum electrodes to deliver quick, reliable oxygen concentration readings across a wide measurement range. The 234-5010 is supplied with a four-wire, 11.5-inch harness and is designed for a first-time fit on specified late-model Acura, Honda and Saturn vehicles.

Which vehicles does the 234-5010 fit and how do I confirm compatibility?

The 234-5010 covers a range of Acura, Honda and Saturn applications from the early-to-mid 2000s. Confirm fit by matching the part number, vehicle year, and engine designation with your OEM reference or parts diagram before ordering.

• Acura: 2003–2006 MDX; 2005–2008 RL; 2004–2008 TL
• Honda: 2003–2007 Accord; 2005–2006 Odyssey; 2005–2008 Pilot; 2006–2008 Ridgeline
• Saturn: 2004–2007 Vue
• Interchange numbers include 12581687, 12581688, 36531RCAA02 and others

How does this sensor affect engine performance and fuel efficiency?

By continuously measuring air/fuel ratios across the RPM range, the sensor supplies accurate data to the engine control unit for proper fuel trim adjustments. That helps the engine run closer to its intended stoichiometry, which supports smoother throttle response and can help optimize fuel use when the rest of the fuel system is functioning correctly.

• Wide-band sensing covers approximately 12:1 to 19:1 AFR for richer and leaner conditions
• Quick-response zirconia element improves ECU correction speed
• Precise readings help protect the catalytic converter and maintain emissions control

What are the construction and durability features of the Denso 234-5010?

Denso designs this sensor to match OE mechanical and electrical specifications for a reliable replacement. Corrosion-resistant materials and a proven sensing element extend service life and retain measurement stability over time.

• Tarnish-proof platinum electrodes for longer-lasting accuracy
• Planar zirconia sensing element for fast oxygen detection
• Four-wire configuration with 11.50" harness for plug-and-play installation

What should I expect during installation and maintenance?

Installation is straightforward when the part is confirmed compatible; the sensor threads into the exhaust bung and connects using the factory-style four-pin plug. No special tuning is required after installation, but verify there are no related intake, fueling or exhaust faults that could mask symptoms or cause premature failure.

• Item dimensions approximately 5.75 x 2.19 x 1.88 inches; weight about 0.25 lb
• Package quantity: 1 sensor per box, ready for direct replacement
• Follow torque specs and use anti-seize where recommended by vehicle manufacturer

Who is this product for? The Denso 234-5010 is intended for owners, fleet technicians and independent repair shops servicing compatible Acura, Honda and Saturn models that need a reliable wide-band air/fuel ratio sensor. It’s suitable when troubleshooting fuel trim errors, restoring proper emissions control, or replacing a failed upstream sensor to regain accurate AFR feedback to the ECU. If your vehicle shows drivability issues, poor fuel economy, or a check-engine light tied to oxygen or AFR diagnostics, this sensor provides a factory-style replacement option.