Thread: Regrounding the O2 Sensor

Is it absolutely necessary to install slimmer fans when switching to the 4-wire on a B14? I haven't tested for clearance yet, but the original 3 wire looks to be pretty close.

If so, any sources for aftermarket slim fans?

I would highly suggest it.

I am personally running these and they are pretty good: Radiator Cooling Fan

Ok, I've read the whole topic.

I'm pretty sure by now my lambda is sluggish. I will put a stainless header on the car next month. So I better get the 4 wire lambda.

I've been shopping around in The Netherlands, there is nothing to be found on Bosch 15727. So somebody from a car parts store called with Bosch. The best thing they could come up with was getting a universal LS-04 or LS-05 lambda. Pricing approx 160 euro and long delivery time.

I checked amazon.com and getcoolparts.com but they don't ship to Holland.

I've learned from the topic it's not a good idea to get one from e-bay.

Please advice me how to get the Bosch 15727 (that number makes Bosch go overhere) I know it's my own fault but I rather get the sensor yesterday then next month.

I'm owning a 1993 Nx2000

p.s. Seller on e-bay states ships only to US.

Forgive me for not reading all 25 pages, but does this apply to the B13 as well? Any way to avoid running a four-wire sensor? Maybe just ground the exhaust?

I need fuel economy wise to replace the o2 sensor. But I also found a great header on e-bay which is made of stainless steel. Stainless steel doesn't seem to ground very well and the o2 Voltage is not very high, also the heating takes quite a while and the grounding should be where the ECU and MAF are grounded, on the TB.

The Nissan's I know (the older ones probably ) only have 3 wires, 2 for heating, 1 for signal, ground is the header/downpipe and the grounding on the catalyst. This is not a good setup for a strong signal. I'm really after a strong signal since I believe I first need to get my car fuel efficient (that's different from fuel economical

However, I only have tested 7 Nissan Nx1600/2000 with my Datascan and the Nx1600 owners didn't report not so great mileage, the Nx2000 owners (including me :P) do. I've did what DC Scotty posted before (see post #370 and up) and I'm pretty sure it's the lambda sensor/ o2 sensor.

I'm running lean when I look at the spark, AAC, AICV, MAF, ignition, air, check. Vacuum check, running Shell, cleaned TB, PVC ok according to FSM, timing is 19 degrees (ok, this one consumes gas) sensor grounding check and a firm belief I need a proper 4 wire sensor that will make sure my stainless header won't act up.

The funny thing is, from the 7 Nx, the one with the crazy lambda (working that is) NOT the 5 times per 10 seconds FSM says, has a stainless header on the stock Nx1600 with 3 wire lambda and owner reports good mileage.

Willing to pay ''$45+30shipping'' + a crate of beer or two for the 15727 Bosch sensor.

^Ok. I finally did this mod using this O2 sensor and it is wired just like this. Hopefully I will be getting more than 215-220 gallons per tank

Nice about time you slacker

Report back on how it goes

^I know right lol. Took forever to find time to finish my swap. I'll put up pics of how it looks in the engine bay and get a meter to check the voltage.

HA. 220 gallons. But no kidding I am having the same problem.

Ha good catch. Can you guys translate that to MPG? I know that our tanks are 13.2 gallons, but honestly if you fill up at 13.2 gallons then you are going to kill your fuel pump fairly quickly. This is why using tank as an estimate is bad. My light can come on at 10 gallons or at 12 gallons, depends on how it feels