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The Denso 234-4070 is a direct-fit oxygen (O2) sensor for specific vehicles, built to OE tolerances so it installs without splicing or adapter work. It is the upstream-style sensor that lets the engine computer hold a closed-loop air/fuel mixture, which affects fuel economy, emissions and driveability. Denso is a major OE supplier, so this part is a like-for-like replacement rather than a universal sensor. Buyers choose it to clear a check-engine light caused by a lazy or dead sensor and to keep the car running as designed.
In stockSold by AAMReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Lowest price we've seen: $35.49 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners of Denso O2 sensors generally report a clean fit and that the check-engine light stays off after installation. Most praise it as a reliable OE-quality replacement; the main complaints are about seized old sensors and the need to confirm the part number.
The DENSO 234-4070 is a light duty oxygen sensor. It monitors the air/fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration, the sensor goes into open loop, and the engine management computer ignores its signal.
Oxygen sensors are also called Lambda sensors. Earlier fuel injection systems used one oxygen sensor in the exhaust to maintain closed-loop air/fuel 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 driveability and turn on the malfunction indicator.
