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The Denso 234-4609 is a direct-fit oxygen sensor for specific vehicles, built to OE tolerances for the air/fuel and catalytic converter monitoring circuits. Denso is an original-equipment supplier, so this sensor is the same design many cars left the factory with, which is its main edge over generic sensors. It suits owners replacing a failed sensor on a compatible application. Fitment is vehicle-specific, so check the part number against your car before buying.
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Lowest price we've seen: $30.88 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
The DENSO 234-4609 is a light duty oxygen sensor, also known as a Lambda sensor. It monitors the air/fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the engine management computer ignores the sensor, a state called "open loop."
Oxygen sensors are among the most sensitive and critical components of a car's engine. Early fuel injection systems used one sensor in the exhaust to keep the air/fuel mixture in closed-loop control. Today's engines may use as many as four sensors, which monitor exhaust gas oxygen content and catalytic converter efficiency.
To work properly, these sensors must meet OE standards within very close tolerances. DENSO First Time Fit® oxygen sensors are designed to meet those tolerances. A malfunctioning or incorrectly calibrated sensor can hurt drivability and turn on the malfunction indicator.
