Denso 234-9009 Oxygen Sensor , Grey

I bought these (replaced all at once) for our 2002 Lexus RX300 and they work perfectly. Lexus electronics are notoriously picky about O2 sensors and Denso is the mfg of the OEM fpr the Rx300. It's been 4 months since installation and there has been ZERO issues whatsoever. Great product. Do yourself a favor if you have a Lexus - don't skimp on cheaper O2 sensors. Google some of the war stories of people who did.

I have P-1155, A/F heater fault, bank 1, sensor 1 malfunction on my 2002 toyota highlander. Check Engine Light was on. I wanted to be smart and tried some cheaper alternatives, what a mistake. Waste of time, money and increased aggravations if you want to use anything other than this on 2002 toyota highlander V6. I put this on after some trial and errors that increased my aggravations. Check Engine Light cleared, now I'm a happy camper.This is my take based on hard way experience. If you have the need to replace the A/F 02 sensor, you will most likely be tempted to go for the cheaper alternatives they claim will work. They will not work, if they do it will be for a very short period of time . I know this one is expensive, but guess what? It's the cheapest, functional and trusted option. If you buy anything different, I will almost guarantee you'll do it multiple times like I did. So, save yourself time, money and aggravations, buy this once and call it a day.Good luck!

Both the check engine and VSC light on my wife's 2002 Toyota Highlander (which she loves) with 135K miles came on a few weeks ago. There was no change to the handling of the vehicle but when I connected an OBDII scanner to the vehicle I got a P1155 error code. The code is for a malfunction of the bank 2 sensor 1 (located behind the radiator in the exhaust manifold). I removed the old sensor and tested it with an ohm meter and it showed no continuity which meant the heating element in the sensor was bad. I ordered this Denso sensor and installed it, cleared the P1155 error code and now the check engine and VSC lights remain off. The hardest part of replacing the sensor was getting the old sensor unconnected from the wiring harness and re-plugging the new connector to the harness. Toyota wanted almost $200 just for the sensor and if I had them install it I believe it would have cost between $325 - $375 to have the sensor replaced. My wife is happy so I'm happy and we saved over $200 by doing it ourselves! FYI - There are lots of internet videos out there showing how to test and replace this sensor.

My wife's Lexus RX300 has Check Engine light on. So I bought a Blue Driver OBD II Scan Tool to find out exactly what's wrong. The tool not only identified the issue but also directed me to Amazon to purchase this Oxygen Sensor.In order to remove the bad Oxygen Sensor from the RX300, Amazon showed me I need a Powerbuilt 648691 Oxygen Sensor Offset Puller.Lucky me that I don't need to buy one. Because Autozone has a tool loaner program. You put down a deposit with your credit card and check out the tool for free. When you return the tool, Autozone refunds you the deposit in full.I attached a ratchet wrench to the Offset Puller to remove the old Oxygen Sensor. It took some elbow grease to loosen the old Oxygen Sensor and that was the only tough part. Then just installed the new Oxygen Sensor.Afterwards I used the BlueDriver OBD II Scan Tool to clear the error code. The Check Engine light vanished and never came back. And my wife's RX300 passed the State Inspection.I purchased this Denso part because it's Lexus' OEM part. The mechanics I watched on Youtube highly recommend to use OEM part and NOT to buy the 50% cheaper after-market part. According to these professionals, the cheaper part will re-live the nightmare and bring back the Check Engine a few months later. That's why I bought this Denso Oxygen Sensor and I'm very happy with it.

Excellent price, arrived in 2 days as promised, adequately packed, and it fixed the problem. Denso included in their branded product box a little tube of their anti-seize thread goo, very nice touch. Thank you Amazon for the great deal, but this one gets a 4 instead of 5 because of Amazon's misleading product title. Though it senses the oxygen level in car exhaust gas, the Denso 234-9009 is an Air Fuel Sensor, not an Oxygen Sensor. The two sensor types are crucially different and I didn't appreciate the confusion. (See last paragraph for why).Info: Our '98 Toyota Camry V6 LE ("California Emissions") lit up its Check Engine light. My inexpensive ODBII code reader displayed P0125, P1153, and P1155 errors. I looked them up in the service manual and focused on the latter, definitive looking ones, both indicating trouble with bank 2 sensor 1 (aka "front sensor", "upstream front sensor", "front upstream sensor", ad nauseam.). It's an Air Fuel Ratio type sensor sticking out of the front-facing exhaust manifold just aft of the radiator, very easy to reach, no crawling under the car, my cat Batman could fix the thing. I unscrewed the sensor, which was stamped "Toyota 89467-41010" followed by "Denso" (hint), and the sensor had well over 100,000 miles on it (hint-hint). I found the Denso brand part number on densoautoparts.com, took a risk on Amazon's misnaming and bought it for a fraction of the price of the Toyota brand. I used my $18 torque wrench with a slotted sensor socket borrowed from AutoZone to tighten the new sensor to the service manual's torque spec, connected the sensor cable, reconnected the car battery, then test drove the car at various speeds and acceleration rates. Check Engine light remained off, zero error codes in the car computer. Looks like the P0125 error code was another symptom of the single failure. I'll wait a few days and recheck with my code reader, then get on with life. Bottom line: buy a simple ODBII code reader (Amazon has them) and download a service manual for error code definitions and parts diagrams. If a repair is obviously simple, do it yourself and save big bucks.IMPORTANT: "California Emissions" cars are sold in several states, not just CA. The moniker is of the standard used to design and build the car; it doesn't mean it can be sold and driven only in CA. On the underside of the hood is usually a sticker stating its applicable standard, "California", or "Federal", or "Not California", or some such. The point: "California Emissions" cars and maybe some of the others use Air Fuel (AF) Sensors in key places in the exhaust train. Those are NOT Oxygen (O2) Sensors, and the two types are NOT AT ALL interchangeable. Be careful. If the service manual says it's an AF Sensor, find the correct AF Sensor to replace it. Same goes for sensors that are O2 Sensors. Last, emissions sensors are for high precision monitoring which heavily impacts MPG ($$). Long term it's cheaper to check online for a highly reputable replacement and the part might be higher priced. Those will do more accurate sensing and will last longer. Nobody makes an absolutely 100% perfect product, but ask the Toyota and Lexus divisions of Toyota Motors Inc. what they think of Denso sensors. No brainer.