Denso 234-4732 Oxygen Sensor

BLUF - Identical replacement for the stock rear o2 sensor part # 22690AA850 on an '09 Subaru WRX STI that works perfectly but needs some split loom. I have an '09 Subaru WRX STI with a turbo-back exhaust and a fun tune giving me 315 hp and 410 torque at the wheels on the dyno. I started getting a Check Engine Light (CEL) for the downstream (rear) o2 sensor for a heater malfunction / general malfunction. I got under the car and found that the stock o2 sensor got the wires sliced. Bummer. The dealership wanted 180$ for the part and 200$ for labor. I was not thrilled with that 400$ idea. I couldn't find the "Subaru" part for less than 120$ online. Not thrilled about that either. Bummer. I did some (a lot of) research and found that this Denso is the exact same manufacturer and part as the " Subaru" part. The heat jacket is a different color and a little less tidy on this. I should have ordered some split loom to go with it because of that. Got rid of the old one and installed the Denso and she started up good as new on the first try. It's been a couple of weeks and no CELs popping up to ruin my drive. 50$ and 45 minutes vs 400$ is a no brainer. I will try to update this in the future if there are any issues with it as I know some people are concerned about longevity. Even so you could replace this 8 count 'em EIGHT times before you hit 400$. Bottom Line - Buy It ! ...and some split loom to protect it.

ALMOST an exact match for the OEM part it replaced in my 2005 Subaru Forester X. The OEM part had a gray insulation sleeve around the wires, this one has black. Not that it would make any difference, but this is the 4th O2 sensor I replaced recently, and the only one that didn't match what I removed exactly. Also, this one didn't have the clip in the middle of the wire meant to attach to the bracket on the top of the transmission like the OEM part, and all the other O2 sensors did. I'm not worried about that, either, because there is a large bundle of wires running near where the wire from this needs to go, and I simply wrapped the wire around that bundle for support and to keep the wire away from moving parts before plugging it in. The wiring harness plug was an exact match for the OEM, and fit perfectly. My car recently had a total failure of the front O2 sensor, also called an Air/Fuel ratio sensor. The car ran, but used extra gas, and stalled when I came to a stop. I got a replacement for that one due to the stalling issue from a local independent Subaru repair shop. I had to disconnect the battery for a while to get the computer to "forget" what it had learned about the failed sensor and so it could learn the new one. Without doing that step, and starting the engine and idling for about 10 minutes afterward, the engine kept stalling like it did with the old sensor. It was like the computer thought it still had the bad sensor, even though I had cleared the code, and ran accordingly. After resetting the computer by disconnecting the battery, the car was hard to start the first time, and idled really fast, until the computer learned the sensor. Now, it runs like it did new again. My wife's car, an 06 Forester, has been throwing codes about the catalyst "performing below expectations" for a while, and recently threw a new one about "fuel trim too rich". I decided since mine had gone bad, hers couldn't be far behind. I got both O2 sensors for her car from Amazon for less than I'd paid for the one for my car. I went ahead and got a new rear sensor for mine too. Preventive maintenance for hopefully another nearly 200K miles. So far, no more check engine lights in either car.

Works great. Fits 2016 Subaru STI

Had p0240 code after installing an aftermarket exhaust (fitted for a WRX) on my 05 Subaru Impreza r.s. Was told by the dealership that I need a front O2 "more than likely" so I changed the front O2 myself because they were charging an arm and a leg. That didn't work. Ended up getting an aftermarket high preformance cat since the cat was the next possibility, or so I was told (would've gotten Subaru to put theirs on but it was 2k+) After looking around for my own answers and after putting a spacer in my rear O2 (didn't work) I decided to go ahead and replace my rear O2. Installed it without the spacers and it's been good for 1000+ miles. FYI ** I don't know much about cars, just recently started learning about them.

Repurchased this item, Amazon sent me a doop of the denso that I am assuming that someone bought denso and placed the doop in the denso box and returned it. The denso has a black sleeve over the wire, the one I received has a green sleeve. I installed this part not knowing this and was still chasing the code. Replacement requested. After flashing my ECU from flex fuel back to 91 for smog, I got a P0137 code. I had already bought a new O2 sensor so made no sense to buy a new one, I changed the wiring and checked for exhaust leaks! So I said I’ll buy a new sensor... I bought the Jebsen O2 sensor, reset my ECU and hoped for no more code and bam! Code again P0137. I flushed the gs tank again to clear any ethanol, checked ground wires... Nothing. So I always was hesitant to buy cheap sensors, the jebsen O2 sensor was $35, I bought this Denso one here for $50 at Autozone it’s $120. I installed this O2 sensor and reset my ECU and BAM! No more codes!!! Now I can continue my life without a dang CEL and pass smog.

This Denso 234-4732 is a perfect fit for the REAR O2 sensor in a 2005 Outback XT. It comes pre-wired with the Subaru connector and a small packet of copper anti-sieze, even though some silver anti-sieze was already pre-applied on the threads. Unlike the 234-9120 front O2 sensor, this 234-4732 didn't come with a push-in wire tie to hold the cable to a bracket next to the propeller shaft under the car. I just removed the push-in wire tie from the old sensor cable and put it on the new one. I originally bought this to replace the FRONT O2 sensor since the Amazon description didn't say which, but when it arrived I realized it was the wrong one. Since then, I read answers to the item questions, and realized that someone had already answered this same question. I still went ahead and bought the Denso 234-9120 for the FRONT O2 sensor, and decided to replace both as the originals had over 120,000 miles on them. So far so good, and I'll follow up if I notice any improvement in fuel economy. I still gave 5 stars since the product is top-notch, I would only fault Amazon for an incomplete description and product photo.

Great Denso Oxygen sensor. I owned a 2006 Subaru Legacy GT AT and 2006 Subaru Legacy GT MT. The oxygen sensor worked great in both vehicles with perfect fit of length. I used the oxygen sensors on an aftermarket Invidia downpipes.

I had a 2005 wrx with an engine code of p0420. this code can mean many things, but it was saying my cat was below threshold. This sensor after the cat and downpipe do not be confused when you scan your car and it says bank one sensor one, a 4 cyl engine only has one bank, even if its our Subaru engines. I was getting a p0420 bank one sensor one. this code could of meant my cat was bad, or my sensor was bad. I took a chance and ordered this sensor and no more engine light. installation was simple. I'd recommend some PB blaster if your car has any rust. mine doesn't but it helped im sure. DENSO IS AWESOME~

Works as OEM no issues.

Works great on my 2004 Subaru sti

Awesome

Solved P0420 engine code on 04 WRX

seems to work great!