Is there a good source to figgure out what O2 sensor I have so I can make sure it is hooked up correctly? It has a mesh nylon-esque material around all the wires, the o2 sensor is a 4 wire that goes to a junction box where the wires change color. Then it goes thru the firewall and somewhere between the junction box and the splice into the pigtail the number of wires doubles. I can trace it out with a fluke to see what wires go to the O2 and what ones don't but I don't know what the wires that go to the O2 actually do so I will be taking shots in the dark.

 

Sensor, sensor ground, heater, heater control.

 

I agree that is what the 4 wires that go to every 4 wire O2 sensor do but what I am wanting to know/figgure out is which wire is for which function (sensor, ground, heater, heater control). The problem is I have no way of ID'ing the O2. Have any ideas?

 

the heater wires have no polarity so if they are a different color, you can wire them however. i would just strip the wires back a little bit. if you are replacing the o2 sensor, you can get a 4 wire universal one. they usually have black, black, white, and green/gray/purple.

 

Ok, but I am pretty sure my O2 is good. Just want to make sure that it is wired up correctly, so the green/gray/purple would be signal, thin black would be ground, thick black would be for the heater, and white would be heater control? If I have a universal I can use this as a referance and make sure the guy who owned my car befor me didn't ef this up too (the obd0-obd1 pigtail was afu). Thanks alot for the help guys!

 

Also I thought if you swapped the heater wire and the control the O2 would not heat up. I also forgot pertinaint info: D16Z6 with unknown 4wire O2 sensor running off of a P28 ECU with a pigtail converting OBD0 to OBD1 in a DX 1990 HB (which I beleive would be refered to as an ED but don't know where to find out what it should be refered to as other than in the vin). Thanks again!

 

In my experience, the ground wire is never black. If you have 2 blacks, a white, and a green/gray/purple?? wire, my guess is:

Blacks - Heater wires
White - Ground
Other?? - Signal

Is the one wire striped with purple/green/gray?

 

None of the wires are stripped, they are actually all hooked up to various things (4 are hooked to the ecu and two are hooked to a singal pole singal throw switch but I don't know why someone would do that whith an O2 sensor). I just want to make sure previous owner (s) didn't mess the O2 sensor also seeing how they had some really stupid wires cut on the engine harness (one for map, one for temp, one for main relay).

 

is your car currently running? if it is, then look at the ecu for codes, or pull them. if there is a code for the o2 sensor, then it isn't hooked up right.

 

Striped, not stripped, like a zebra. Sorry, it's easy to misread.

 

Striped, my bad. Wask reading it kinda quick. After giving it a better look it is a Bosch connector. The wires coming from the O2 are white, white, black, gray. The car did run prior to pulling the harness apart but not properly.

 

Just checked to see where things are hooked up to: White-A6 (PO2SHTC O2 sensor heating element), White-A25 (IGP2 to main relay and to ground), Black-D14 (PHO2S O2 sensor), Gray-D22 (Sensor ground). Does that sound correct (this is on an OBD1 P28)?

 

Not to thread jack or anything, but I have a question about my o2 in my crx too. My crx is just a project car now and I haven't had an o2 sensor since I got it running, but my ecu never throws a code saying that its missing or anythings wrong. I thought this was very odd.. I wanted to know if any of you have heard of or had this problem before. The cars about ready to go into paint so I'll worry about this more seriously once its put back together if I don't find the solution soon. My car is still obd0 with B18a1 using pr4 ecu.

 

Just read a thing that said that all but 1 wire are correct, that one being the wire that is hooked up to A25 (IGP2 to main relay and to ground) but what I just read said it should go to "Grn goes to Grn-Wht then goes to intake air temp sensor." What exactly does this mean? Should I relocate tis wire?

 

According to Bosch, they gray wire is ground (check!), the signal wire is black (check) and the white wires are for the heater circuit (check!). Looks like you have it installed correctly. I would double check that you see continuity from the ECU plug to the sensor plug though.

 

If the ECU is chipped and running a program that ignores the O2, very possible.

 

Got the car together around 11:30 last night and she ran well. Today I drove it to work and code 41 (O2) came back along with 17 (VSS). The car idled at a super nice 500rpm's as solid as a rock. There was no hesitation and the car ran a bit rich but nothing bad. So is my O2 bad or do I need to swap the heater and heater signal wires around (I am thinking it is the latter because the car was not seeking)?

 

So aftre driving the car again I noticed there is a delay in throttle response (very slight) and if I recall correctly that means the O2 is bad.

 

im not sure ill take a look at that. i dont know i could plug in my zc ecu and see if it throws it then.. wouldnt surprise me with all of the weird stuff my crx seems to have been put through.

 

So what do you guys think, bad O2 or swapped wires?