Keep your engine's air-fuel feedback accurate with the DENSO Oxygen Sensor 234-4804, a 4-wire heated, narrow-band sensor that drops in as a direct-fit replacement for the 2003-2004 Toyota 4Runner (V6-4.0L). It's cataloged for the downstream, left-side position, where the sensor reads the oxygen content of the exhaust so the ECU can trim fueling and monitor catalytic converter operation.
- Laser-welded stainless housing: resists corrosion, while a PTFE filter blocks contaminants under harsh engine conditions.
- Dual-layer protection: shields the ceramic element to support fast, reliable response times.
- Aluminum oxide trap layer: DENSO's design intended to protect the ceramic element from silicone and lead poisoning.
- Threaded fitment: threads into the exhaust bung, with a 0.708 in thread diameter, male connector, and a 13.39 in wiring harness.
Built and tested to DENSO's strict OE standards for exact replacement. If a failed oxygen sensor is the cause of your rich/lean codes, this replaces it; diagnose the underlying cause before installing. Country of origin: Japan.
Interchange: 213-2935 · 2132935 · OS1591 · 13355 · ES20223 · 24848 · SG837 · 8946560220 · 250-24906 · 25024906 · 350-34269 · 35034269. Manufacturer part number 234-4804 (also 2344804).
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Which vehicle does this DENSO 234-4804 fit?
It is a direct-fit replacement for the 2003-2004 Toyota 4Runner with the V6-4.0L engine. Check the Buyer's Guide tab to confirm the fit for your specific vehicle.
What position is this sensor for?
It is cataloged for the downstream, left-side oxygen sensor position, where it reads exhaust oxygen content to help the ECU monitor catalytic converter operation.
What type of oxygen sensor is this?
It is a 4-wire, heated, narrow-band oxygen sensor with a threaded mount, male connector, 0.708 in thread diameter, and a 13.39 in wiring harness.
What does the aluminum oxide trap layer do?
DENSO designed the trap layer to help protect the ceramic element from silicone and lead poisoning. The laser-welded stainless housing and PTFE filter also resist corrosion and contaminants.
Will this fix my check engine light?
If a failed oxygen sensor is the cause of your rich/lean codes, this replaces it. Because those symptoms can have other causes, diagnose the underlying issue before replacing the sensor.
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