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Review on 🔥 Denso 234-9012 Air-Fuel Ratio Sensor | 4-Wire | Direct Fit | Heated | 7.09” Wire Length by Ken Wilson

September 09, 2022

A/F ratio sensor for a 2004 Sienna next to the firewall.

This is one of 2 air/fuel ratio sensors on a 2004 Sienna, located near the firewall high up with the wire up. Turn the wrench enough to get the correct torque. This sensor appears to be resolving P2238 and then P0328 after replacing the front A/F sensor (234-9042). So far both codes have disappeared after about 4 weeks of driving. , both A/F sensors must be changed at the same time.

Pros

Ideal for outdoor activities

Cons

Repair

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