Denso 234-9009 Oxygen Sensor, grey

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!

My 1999 Lexus RX300 was getting CEL (P0125, P1030, P1033 & P1035). Read the postings on ClubLexus and found Denso 234-9009 is perfect fit for Bank 1 Sensor 1 (behind firewall, access from underneath the vehicle). Removing the connector is the biggest job. Used a pickup tool with wire prongs to hold the sensor connector part from the top, pressed the tab on the right connector and disconnected relatively easily. Jacked up the front passenger side, went underneath the vehicle and sprayed PB blaster penetrating oil on the old sensor threads, waited for a few minutes and was able to get it out easily using an O2 sensor removal tool. Applied the anti-seize that came with the package on the new sensor threads and installed. Total time spent was under 30 minutes! Disconnected the battery negative terminal for a few minutes, then started the engine and the codes didn't come back! Check out the pictures posted in the images section. This sensor works for Bank 1 Sensor 1 (before catalytic converter, access from underneath the vehicle) and Bank 2 Sensor 1 (between the engine and radiator, accessed from the top). Note: Recommend using two jack stands for added safety while working under the vehicle. PB Blaster: Blaster 16-PB Penetrating Catalyst - 11 oz. O2 Sensor Tool: Powerbuilt 648691 Oxygen Sensor Offset Puller Update: February 16, 2014 The Check Engine Light (CEL) is staying off and the mileage has improved. My vehicle registration is coming up and it is due for SMOG check. I'll update the review with the results of the test.

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.

1999 v6 solara, fighting a po171 check engine code for 3 years, replaced all kinds of parts, including cheap front o2 sensors, after using the cheap front o2 sensors , I replaced them with these 2 denso sensors, drove for a day , now runs like a top. 3 weeks later still no codes. You may or probably will get a sensor code right after installation of the sensors but I drove the car for a while and was able to clear the code hopefully permanently.

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.

Delivery was on time and installation easy. Was familiar with the on dash icons and had the hardest one to access replaced by my garage = $300+.was asked to replace other location but put off due to $$$ . At least 4 years passed and the other failed and I knew the dash icons and the location, right up front and so easy to access on my 2001 Lexus RX300. took me about 20 min. to install. Started up the engine and all warning icons disappeared. I may mention that this is an OEM part identical to the 1st original replaced and the now the 2nd one I replaced. The 1st one replaced is positioned to the rear of the engine and is easier to access from under the car w/the possible help of a 2nd pair of hands to unlatch electric plug while you pull it free. By replacing this my self I saved at least $200 and the front location does not require that special off set, split socket needed for the rear location. Good luck and an excellent provider and price ,better than ROCK AUTO's price.

If you have a Toyota, don't buy some other off brand oxygen sensor! This is a factory replacement, plugs in perfectly, cleared my check engine light code after I disconnected the battery for a few mins and hooked it back up. Use the Amazon part finder to make sure you have the right sensor for your car. Make sure that you know if your car is a California car or a normal one, says under the hood on a label if it is a California car. You'll need a different sensor if it is. Several days before you change the sensor, spray penetrating oil on the sensor once a day. That helps a ton!! When the day comes to change the sensor, try to do it when the manifold is hot, but be careful!!! The sensor will most likely come right off. I changed a sensor once that was hopelessly frozen in place. I had to have a mechanic do that job. He had to heat the manifold up, break the sensor out, and re-tap the threads. He was upset that I didn't buy the sensor from him (for about 2x as much, I can see why he was mad! Funny he couldn't see why I didn't buy it from him) Oxygen sensors are not "needless stupid sensors that only improve your gas mileage"!!!! One thing that can happen when your O2 sensor needs replaced is your catalytic converter can go bad. O2 sensors tell the motor how to mix the air and fuel. If your sensor is bad, the engine doesn't mix fuel and air properly, creating more pollution. Then your cat works extra hard to clean up the pollution. Don't be a tight wad, just buy the dumb thing and replace it!

Since this is an OEM item the fit was perfect. Scanner (also purchased from Amazon) showed trouble code bank 1 sensor when check engine / VSC / Track off trouble lights went on. Replaced both front and rear upstream manifold sensors and now good for another 75,000 miles or so. Most difficult part is squeezing the electical connector to get the old unit out. Be sure to buy sensor socket which makes removal of old and installation of new sensor a breeze. My wife's 2003 RX300 running like new again. Thanks to Amazon supplier pricing we saved a ton of money over a dealer installation. Will probably replace the downstream sensor near the catalytic converter and avoid any failures in the near future. That one requires a different sensor since it's bolted on. It's less expensive than the manifold sensors but will take a bit more time since rear seat on drivers side needs to be removed to get to the electrical connection. Certainly worthwhile for the savings involved.

You must be careful when changing these parts If lean air fuel mix codes come on, it could be from vacuum leak, mass air sensor or air fuel sensors. Harder to diagnose are intermittent air fuel sensors failure. I had to replace my Highlander 2002 290,000 km air fuel sensors as they were giving me lean air fuel mix engine code. First I had lean air fuel sensor code P0171 and P0174 codes. But engine was running rich as computer tried to compensate for lean conditions. It does not do all the as if I erased the code it would run fine for few days and come back. At First I though it was the mass air sensor, as the issue was both bank were running rich according to the scan tool. I changed it. It run well for few weeks but codes still came back Then I decide to replace the rear air fuel sensor near firewall by my buddy car shop. Then the issue P0171 was gone. It run well for a week. Then P0174 started to come on, again I could erased the code and run for few weeks without issue. Then I decided maybe I should change the other air fuel sensor too. I was looking at this Amazon air fuel denso sensor for a while, worry to order as lots of stories about Amazon fake Toyota parts. But I decided to try it. It was easy to replace this one as it was located front of the engine, it wasn’t rusted, I make sure I tried to remove the old one before I ordered this new one. Just be careful as old was can be stuck and strip the threads. The new sensor came with denso box with sealed bag inside Wiring color and connector all match to original After installed without any issue, the code is gone. p0174. It has been almost a week And we are having a cold snap in vancouver this week Today -13C I will update in the future and Will see if it still works after as one of the review mentioned that the sensor failed after the first frost.

Direct fit plug-and-play and made by Denso, the manufacturer of the original Toyota part. The Amazon price is 1/4 of what the dealer charges and still about $50 less than most online parts suppliers. Free shipping as a bonus. The install cleared my check engine light and is working like a charm.

Everyone quotes 350 for the part. Got it for 200 cad with taxes. Very very satisfied with the product. Hope it lasts

Picked two day delivery and it arrived on time. Installed both front O2 sensors as my engine light was on. The code read C420 something about bank 1 and the catalytic converter. I had just changed the rear sensor, so time to do the other two. Installed them today, cleared the codes and behold no engine light and I now have three brand new original equipment sensors at the lowest possible price I could find. I'm thinking I will get better fuel economy now. Thanks Amazon. Your site improves with each passing month. Keep it up.

very good