Denso 234-9021 Oxygen Sensor

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Price: $110.82    

Product Feature

• Manufactured to detect the amount of exhaust gas air fuel ratio
• Constructed from durable material
• Features zirconia solid electrolyte
• Highly accurate
• Easy installation

Product Description

Denso Oxygen Sensor is designed to detect the amount of the exhaust gas air and fuel ratio. It is constructed from durable material that is corrosion and abrasion resistant. This sensor features zirconia solid electrolyte integrated with alumina heater substrate which precicely controls the amount of oxygen concentration that flows into the diffusion layer to limit current flow. This sensor can easily be installed and ensures longevity.

Denso 234-9021 Oxygen Sensor Review

My wife's 2001 Toyota Sienna had the Check Engine Light (CEL) on and was a P1135 error code (faulty signal O2 Sensor) on the Bank 1 Sensor 1 (which is on the back of the engine by the firewall). I bought 1 of these to replace the one the error code indicated... it was a perfect match, but after clearing the error code, a P1155 error showed (the one in the front of the engine... easier to get to) which at 117,000 miles should have been expected. I ordered a second sensor and now we're all good. (OEM has 2 different sensors... the back one had a slightly shorter wire lead... aftermarket they use the one with the longer leads (this product) to replace both front O2 Sensors.)

If you have a high mileage car, you may want to replace both... it is a wear item.

Helpful resources
1) The Toyota Tech document to help you determine where the sensor that needs replacing really is:
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2) Good video here for how to replace the Bank 1 Sensor 1 (tucked in by the firewall):
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