Buy Denso 234-9021 Oxygen SensorDenso 234-9021 Oxygen Sensor Product Description:
- 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.
Customer Reviews
Most helpful customer reviews
19 of 19 people found the following review helpful.
By Nikon Owner
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 resources1) The Toyota Tech document to help you determine where the sensor that needs replacing really is:[...]2) Good video here for how to replace the Bank 1 Sensor 1 (tucked in by the firewall):[...]
14 of 14 people found the following review helpful.
By R. Vennam
Check Engine Light: P1135P1135: A/F Sensor Heater Circuit Malfunction (Bank. 1 Sensor 1).Bank. 1 Sensor 1 in my car was the sensor between the engine and the firewall. Its tricky to get to, but doable with a big wrench, and a couple of jack stands.Here is what I did:1) Find the sensor.2) Spray it well with some PB Blaster while its warm, let it soak for a day.3) Jacked it up, got underneath, and remove the sensor with a big 22mm wrench. This took a lot of effort.4) Put some anti-seize (comes with it) on the new one and screw it in.Problem fixed.
8 of 8 people found the following review helpful.
By Stephanus A
I ordered this A/F sensor for my 2002 Sienna (bank 2, sensor 1; the easy one on the front exhaust manifold). It came fast by USPS in sealed packaging, complete with the anti-seize compound. It looks exactly the same as the original - the sensor, the wire length/color, the connector - it's the same thing. Removing the old one was hard: several rounds of PB Blaster + time, hard to unplug the connector - push in the plastic securing tab on the connector facing away from the engine! Installing this new one was simple: some anti-seize compound on the thread (only!), screw in by hand, then tighten with a wrench with feel, snap in the connector, put back the clamp holding the wire in place = I just saved at least $200 compared to the dealership charge.
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