15733 Premium Universal Fitment 4-Wire Oxygen Sensor with Installation Kit

The Bosch 15733 Universal 4-Wire Oxygen Sensor is a cost-effective alternative to direct-fit OE replacement sensors when harness splicing is required. By reusing the original factory connector with Bosch's SmartLink enclosure system, it eliminates the need for soldering or specialized crimping tools while maintaining environmental sealing. Fit & Compatibility: Features standard M18 x 1.5 threading with a 22mm hex body, fitting standard exhaust bung locations across a wide range of Asian, European, and domestic 4-wire narrow-band applications. The kit includes 26 inches (660mm) of high-temperature lead wire, providing adequate length for custom routing. Installation: The included SmartLink/Posi-Lock connection kit allows direct pin-to-pin coupling without soldering, which Bosch explicitly advises against to prevent wire fatigue and resistance variations. Match the two white heater wires directly to the OE heater leads, the black wire to signal, and the gray wire to sensor ground before securing the weather-pack outer sleeve. Quality & Construction: Utilizes a planar zirconia ceramic sensing element with an integrated heater circuit for quick operating temperature light-off. The sensor body uses a double laser-welded stainless steel casing, and threads come pre-coated with anti-seize compound directly out of the box to prevent galling during torque-down. Durability: The SmartLink junction box forms a submersible, vibration-resistant seal that prevents road salt, water, and engine bay oil mist from penetrating the reference air gap. Signal output stays stable under high thermal cycling, eliminating dynamic air-fuel feedback fluctuations and clearing heater-circuit fault codes. Value for Money: Saves significant cost over application-specific plug-and-play harnesses by transferring the original connector housing, making it an excellent value for money solution for harness repair or legacy vehicle maintenance.

2008 BMW 335i with the N54 engine, bought this to clear a 2C7B code (secondary oxygen sensor fault). The splice kit is really nice, it takes about 30 minutes to splice into the BMW connector, at a much lower cost! I put about 300 miles on the car since i did this repair and the code hasn't came back.

Awesome always great parts. Bosch knows what they’re doing.

My 2005 Mercedes 230C failed smog inspection for the first time by .01% (the lowest fail percentage). Although the car ran fine, the "Check Engine" light had been on for a few months. After checking online for the "Fail Codes" listed on the Smog Test receipt, the codes pointed to the "Downstream o2 Sensor (Oxygen Sensor)" making the fuel mixture too rich. So I called a local Smog Repair shop and I was qouted $220 dollars to replace the part. My former brother in law who had his own auto repair shop told me long ago that mechanics get a 50% discount off list price of new parts, but always put the list price on your bill. So I ordered the part from Amazon, and had my local independent mechanic install it. I saved 70% from the original smog repair quote by doing it this way. This Bosch 15733 Oxygen Sensor came in Bosh box and with a Universal Connector plus Wiring Instructions. I think any weekend mechanic could handle the job within a few hours but.... I am getting too old to climb under a car anymore. The replacement requires Auto Lifts, a standard Open End Wrench, and Wire Crimping Tool. In my case the Universal Connector supplied Did Not Match the one on my car, so splicing the 4 wires to the original factory connector was required. The 4 wires consist of 2 signal and 2 grounds, and had the same color codes as my original wires. Once removed, the O2 Sensor appeared to have a small amount Black Soot around the base of part as a result of running too rich. After installation the "Check Engine" light went off. The one thing that I havn't seen in the Amazon Reviews is that my mechanic had to Re-Set the Car Computer. He also told me I had to drive 60 Miles More so that the car computer could re-evaluate the "New o2 Sensor" in full cycle. If you re-test right away, you will FAIL the Smog Test. This is because the car computer retains the old sensor data plus adds the new sensor data, and averages them both until the car computer re-sets again in 60 miles. After that I had the Smog Station re-test my car, and Pass it did. IMPORTANT: On my car there are both "Upstream" and "Downstream" o2 Sensors. Make sure you Evaluate The Smog Test Fail codes carefully and Order The Correct Failing Sensor. I hope my review helps, you Do It Yourself-ers should Save Even More!

I chose these sensors over the high cost of direct replacements. It is the exact same sensor that was on my car. It came with a 2 foot lead as discribed with some nice connecters. It has good instructions of how to install the sensor and connectors with how to make sure you attach the correct wires from the original sensor to the new one. The only issue I had was the location of the rear sensors on my 2002 VW Passat GLX V6. The space is very limited to get at the wires when trying to install the connectors. I ended up not using the supplied connectors. Instead I used spade connectors and heat shrinked the connection. I wanted to solder the wires but the space didn't allow it. If you have the ablity to completely remove the existing sensor and wire to either use the supplied connector or any other connecter that is water tight to keep the elements out so you won't short the sensor then this is great. I only installed them last night, so I can't say if it solved my error codes on the car, but I know with my scan tool that this was causing my fault codes. I glad I looked on amazon to find the sensor rather than dropping the money for the same sensor at the local auto store. I will use these again if I need too. Great find.

Do not order from Bosch store aka Prime Source Distribution, whatever name they have, one sensor was good, other one was a defect, they made constant excuses saying it was an install issue. They claim they're a 3rd party and do not accept return. Tried to order a new sensor and they went from $28 to $52 from this same seller. Totally ripped off.

I didn’t know “universal” meant I’d have to wire it myself. Apparently don’t have the knowhow to do that because I thought I followed the instructions carefully, but after I installed the sensor the check engine light came back on even after I reset it using my OBD II scanner. Turned off the engine, restarted and reset it: still on. I’m ordering an unstream Delco one for $50 more, but worth it for direct replacement.

Used it on a 2001 Audi TT, 1.8 225hp Quattro. This was my sensor before the cat converter. It went in without issue. This is the first 02 sensor I have used that needed to be wired.....cannot believe how simple this is. For the money savings this was incredible and only took a few extra minutes. Instructions were great and it came with plenty of wire and insulating jacket. No more engine light and I know I am feeding the proper fuel/air mix as to not damage my very expensive cat converter. I know I can trust the Bosch name and of course Amazon. Has been in the car for several thousand miles....no issues.

Funciono perfecto para una aprilia mana 2009, solo que tuve que usar un conector de 4 pines en vez del smart link que incluye El cable negro es positivo señal El cable gris es negativo a tierra Los cables blancos son del calentador no importa en que orden, no tienen polaridad

Never done an oxygen sensor before but this seemed to work. It’s a universal kit with several different plug options, that took a bit of extra thinking but I got it done on my 2000 Chev Tracker 2l.

取り付けも安易で交換後もエンジン好調です 純正品より安価で耐久性は今後ですが非常に満足しています

No ha presentado falla desde su instalación en la salida del múltiple.

ロードスター（NB1）の燃費が７キロ台とあまりよくなかったので、もしやこいつかと思って購入。ちゃんと新品が届きました。 交換したら、一気に１０キロ以上に燃費が伸びました。これからまた燃費をチェックしてみますが、これまでどんな乗り方をしても断じて８キロ走ってくれなかったので、この向上は気のせいではないでしょう。アクセル踏めば走り出すし、個人的には大満足です。