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πŸ”Œ denso 234-9021 upstream heated oxygen sensor: advanced 4-wire plug with 14.17” harness logo

πŸ”Œ Denso 234-9021 Upstream Heated Oxygen Sensor: Advanced 4-Wire Plug with 14.17” Harness Review

4

Β·

Very good

Revainrating 5 out of 5Β Β 
RatingΒ 
4.8
πŸ”¬ Automotive Sensors, πŸ› οΈ Replacement Parts

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Details

BrandDenso
MaterialZirconium
Item Weight0.26 Pounds
Mounting TypeThreaded

Description of πŸ”Œ Denso 234-9021 Upstream Heated Oxygen Sensor: Advanced 4-Wire Plug with 14.17” Harness

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

Reviews

Global ratings 4
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    3
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    1
  • 3
    0
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Type of review

Revainrating 4 out of 5

Easy to Install for Oxygen

Installed both Denso Air/Fuel Sensors #234-9021 on our 2000 ES 300; Rows 1 and 2. Very easy to remove with a 7/8" open end wrench (22mm is also fine) after applying the penetrant and allowing the engine to warm up for about two minutes. Bank 1 between the engine and firewall wasn't that easy but broke free with a slight nudge. These sensors were replaced after 166,000 miles as part of routine maintenance to avoid the "ignition engine" problems some have experienced. Sensor under Auto 02 will be

Pros
  • Manufactured for Exhaust Mass, Air/Fuel Ratio
Cons
  • Secret

Revainrating 5 out of 5

it unscrewed easily by hand

2003 Avalon XLS Bank 1 Sensor 1 replacement. The key to replacing a sensor is making sure you are working with the correct sensor. On the Avalon, Bank 1 Sensor 1 is located between the engine and the vehicle firewall. see photo gallery. I ran the engine for about 1 minute to warm up the manifold (but not hot), then sprayed some PB Blaster, waited a few minutes and then snuck in with a sensor extraction tool (https://smile.amazon.com/gp /product/B00390BS7C/ref=oh_aui_detailpage_o01_s00?ie=UTF8&ps…

Pros
  • Specifications Solid Zirconia Electrolyte
Cons
  • Fair enough, but...

Revainrating 5 out of 5

2001 Camry V6 with Sensors

It has been 100 miles since installation and the Check Engine light has not come on. I originally had a CEL code of P1135 and also showed up as P1130 prior to installation. After much research and confusion, I bought this part with the thought (hope) that it was the right one. Also part of the confusion was which sensor was actually faulty as I understand the Camry V6 has 4 of these. I chose source code P1135 which I read referred to the sensor on the back of the engine next to the firewall…

Pros
  • Easy Install
Cons
  • Damaged

Revainrating 5 out of 5

Exact replacement, fixed fault code P1135 in 2002 Avalon XLS

I have a 2002 Toyota Avalon XLS. This was an exact replacement and solved the problem with code P1135. My check engine and VSC lights came on. It wasn't caused by a bad or loose gas cap (which could also be the cause) so I went to Auto Zone and they checked the code with a code reader for free. The trouble code was P1135 for Bank 1 Air Fuel Sensor 1st ratio sensor. This is of course the most inaccessible sensor (arrg!). It is located in the exhaust manifold at the rear of the engine just in…

Pros
  • High Precision
Cons
  • Weight