Denso 234-4741 Oxygen Sensor

My 2.3L stroker Evo 9 with a 20G turbo had been getting the occasional check light especially when sitting in traffic. Code was P0170 Fuel Trim Bank 1 / Abnormal Fuel System. My LTFT fuel trims checked out to be +25% therefore triggering the check light. This indicated that the engine was running lean but upon WOT my exhaust blows our a huge puff of black smoke indicating that it's rich. Further inspection of my spark plugs revealed that they were cakes in black soot and dry carbon again indicating that it was very rich. My bumper was also coated with exhaust stains. My knock sensor would also flash occasionally when boosting. I had read that knock can also occur in a "too rich" scenario.My range per full tank with a reasonably light foot was about 300-320km (6.5km/L) with 70-80% highway and 20-30% city start stop traffic. Occasional turbo spools but never past 4k RPMs.I then installed a AEM UEGO Wideband to confirm that I was running rich instead of lean and indeed I was. Gentle acceleration would show 8 or 9 AFR on 98 RON and even while cruising on the highway I could do no better than 11 or 12 AFR.I then decided to change out the O2 sensor and lo and behold, on my second full tank I achieved 390km (8.5km/L) before the empty light came on. I could have easily achieved 400km before the light came on. There was no change to my driving pattern and I still kept my gear shifts within 3-3.5k RPM. AFR upon WOT will now read 9-10 and cruising will now read 13-14.Part number is correct on the sticker pasted on the Denso box, however the numbers engraved on the sensor itself is different. Upon comparing with my old sensor, the numbers were also different (not sure if the old one was from the factory or it had been changed before). But the thread and length both fit perfectly and there have been no issues. No more check light and my knock sensor has picked up much fewer knocks now.

Amazon is a good place for automotive parts,once you got the parts model and you can found it here.is been a couple of months my CEL remained lit,my local workshop said that i had a faulty O2 sensor at front and ask for a ridiculous price,amazon only cost about half of it! I installed this on a Mit 4g63 the part fits and worked perfectly,the factory original part is also a denso and this part is almost identical except the wire was slightly longer.DIY and it only tooks 35mins to be done,the CEL light went off right after the engine starts.I am very happy with this part,I also saved a good deal of cash by buying it here and changing it myself!

I noticed my gas mileage on my Mitsubishi Evo 9 had went from a normal 22-23 mpg to about 19 with no heavy driving, just going to and from work (about 50 freeway miles round trip). My low fuel light came on early and it caught me off guard. Since my check engine light is always on due to a faulty EGR solenoid, I have to check my codes every so often. Turned out I had a P0031 pop with a P0134 HO2S heater control curcuit low. This was caused by heater element failure within the sensor. I checked the wires and connectors to make sure it wasn't chafed or exposed, and decided the sensor was bad. First search I did on Google brought up Amazon with a great price just below $40. It was the same part number listed by forum members on Evolutionm.net. I went ahead and ordered it and it arrived quickly. Out with old, in with the new and everything works perfect. Now if only I could find a suitable EGR solenoid...Thanks Amazon, you guys rock.

Bought so many of these, save lots of money compare to dealer parts, direct plug in and play

My Evo IX BBK Full install was stalled out by this broken O2 Housing Front O2 sensor. I found out at 5:30 PM and was being quoted $360.00 for the replacement delivered in a few days, ARRGHHHH! so I searched around...And found this page:[...]Which seemed to confirm that Denso 234-4741 replaces Mitsubishi 1588A064.Still not certain, I kept looking and found this:[...]"OXYGEN SENSOR CROSS REFERENCE" confirmed on page 46 that:Mitsu MN153010 = Denso 234-4741Seeing as Amazon's "Make Sure It Fits!" confirmed it was right for my car and it's Amazon I had maximum confidence. Ordered it overnighted for $70.39 (instead of the $332.00 shipped they want elsewhere: [...]). Placed my order around 6:55 PM and it was delivered the NEXT DAY at 11:48, installer confirms the part has the exact same plug and is compatible with the stock sensor, the only difference being the wire is a little longer.All of which I documented here:[...]Nice job Amazon!

Great value

Item is great will buy again

Part arrived correct the first time and is a direct fit for an EVO IX. Denso supplies the OEM sensor and dealer cost is $300.00 +Denso 234-4741 is the oem equivalent plug and play front sensor for an 06 EVO IX and can be sourced for around $ 40.00.My 06 EVO IX MR has 57,000 mi on the original sensor. My 06 EVO IX SE just turned 42,000 mi and the original sensor failed.Luck of the draw I guess.Hope this helps.