Denso-234-4509 O2 Oxygen Sensor

Resolved the computer code and Service Engine Light. Pretty easy to replace with just metric ratchet set, metric wrench and mallet. Hardest part was getting the old one off. Tried PB Blaster, but not sure that helped. Tried running the engine for awhile to get it nice and hot (be careful under there when it is hot, easy to get a nasty burn). I think the heat may have helped along with a mallet to pound on the wrench handle. Either that or just persistence. Comes with a bit of anti-seize compound. All the attachment clips fit exactly which is great because these are always a bear to get off without breaking. In this case can just cut and grab without having to try and save them. Highly recommended to fix this sensor code.

Exact fit for 2004 lexus rx330. Fixed check engine light issues.

This was a direct replacement for the oxygen sensor on my 2007 Lexus RX350, Canadian built SUV. Note that this part is for bank 1, sensor 2. The sensor is located under the vehicle, aft (downstream) of the cat converter, in the exhaust pipe, closest to the driver's side. Denso (brand) are the same folks that supply many of original Lexus factory parts for this vehicle. It is a perfect match, right down to the wire length and clip fastener spacing! Easy to replace! Once under the vehicle it takes 20 minutes, including the time for the spray rust penetrant (Pb Blaster) to make removal a breeze. Tools you will need: - Jack and jack stands, unless you are skinny! NEVER go under a vehicle supported by a jack alone! - 7/8 open-end wrench (Save your money and don't buy the special oxygen sensor tool. I bought it and didn't use it) - Flat blade screwdriver to pry out clips securing cable. (Cable comes with new clips, so don't worry) - Eye protection. - Wire cutter (Optional, but snipping the old wires close to the sensor makes removal more pleasant) - Spray rust penetrater in a can. (I like Pb Blaster) - Vehicle computer code reader/reset tool (I own one, but many of the auto part chain stores will reset free of any charge) Normal thread (righty, tight - lefty, loose). Snug-up, but don't be a gorilla. 35 foot pounds, if you really want to put a torque wrench to it. Make sure the car is at ambient temperature. This is important for easy removal. The dealership quoted $400-$500 for this repair. I did for under $100. If you can change your tire, this is only slightly more difficult. No more check engine light or poor gas mileage. The part is working very well for me. I hope it does for you as well!

Item was as described. Arrived on time. Took care of my check engine/vsc light on my 2004 Lexus RX330. I would recommend.

I had a P0037 code on a 2005 Lexus RX330. That code also triggered the VSC/Traction Control lights. The car was noticeably down on power/smoothness and fuel consumption had also increased. This Denso oxygen sensor fixed it all and the car runs much smoother now and fuel mileage has returned to normal. I compared the factory Toyota/Denso sensor to this replacement Denso one and they are pretty much exactly the same, including all the mounting clips. It was a no hassle direct installation, took about 20 minutes start to finish. I did jack up the left side slightly for a little extra clearance and used a 7/8 Craftsman open end wrench(approx 11 inches long), no need for the special socket, there is plenty of clearance for the wrench. I did not use any heat, penetrating solution, etc and the old sensor popped loose with just a bit of force, about the same as loosening a lug nut. The leverage from the wrench is much better than that of a ratchet /socket.

great item

I ordered this sensor for my 2005 Toyota Highlander V6 AWD after having an auto parts store chain scan for an error code I was receiving (Check engine light and VSC both illuminated). I was getting code P0037 which indicated Bank 1, Sensor 2 on the passenger side after the catalytic converter. I also ordered a 22mm offset wrench and glad I did because it would have been extremely difficult removing the sensor without it. My car has 180,000 miles and this was the first time it was replaced. The sensor is the identical Original Equipment Manufacturer (OEM) that Toyota still uses on their vehicles; I stayed away from a cheaper, generic sensor. The hardest part is getting the sensor to "break free" since its been on the vehicle for over 11 years. I also sprayed it with liquid wrench a few times days before I attempted to remove it. I also drove home about an hour and removed it within about 10 minutes after shutting the car off so the exhaust pipe was still pretty hot ( wear long sleeve shirt). I didn't use a lift or ramps and it's not too hard to replace since the Highlander sits high and has enough clearance underneath. The check engine light and VSC light extinguished after starting the car the next day while leaving work after I had driven about 30 miles with the new sensor installed. I was getting ready to go back to the auto store on the way home if it didn't reset itself to have them clear the code or maybe order a code scanner, but it wasn't necessary. 5 stars on this part based on getting an OEM replacement at a great price and quick shipping. I hope this one will last another 180k miles. If anything, Amazon could improve the packaging since a bubble lined envelope does not appear to adequately protect a small, electrical and sensitive sensor part that should not be dropped or handled roughly.

I purchased this Denso 234-4509 to replace the downstream O2 sensor on my 2015 Toyota Highlander Limited (U.S. model), and it worked perfectly. The part arrived well-packaged, brand-new, and matched the original factory sensor exactly, same connector, same length, same markings. Installation was straightforward, and after replacing it, my Check Engine light and “Check AWD System” message disappeared immediately. The engine is running smoother, and the readings stabilized right away. I know there are many counterfeit sensors out there, so I was a bit cautious ordering from Amazon, but this one turned out to be 100% genuine OEM Denso. Highly recommended if you want the right part without paying dealer prices.