How do I: Install the O2 wire for an AFR gauge?

CFar · 06-28-2006, 12:23 PM

I picked up a boost gauge and have that hooked up all well and done, but I also picked up a narrowband AFR to fill in the extra spot of my pod (the AFR was inexpensive). I'll pick up the real deal wideband if I decide to go in and start dealing with the engine, but this is just something cheap and easy to fill a void.

In any case, where do I find the wires for the O2 sensor to tap into, and which ones do I tap into?

Thanks,
Chris

CFar · 06-29-2006, 03:24 PM

Anybody know? Its just one green wire that needs to tap into the O2 sensor.

crystal_Imprezav · 06-30-2006, 10:42 AM

Tap into the Blue wire, its the +signal wire. The two black wires are for the heater and the one white wire it the signals ground.

CFar · 07-01-2006, 06:10 AM

Cool.

Next round of questions:
1) Do I tap the rear or front O2? This sensor reads from 0-1 volt
2) Where is the best place to actually tap the sensor? Back at the sensor itself or somewhere near the ECU?
3) If I tap the sensor, will it draw too much current, volts, wattage (not sure on electrical terminology) away from the sensor and change the readings that the ECU is seeing, therefore changing the programming (ECU add/remove fuel/timing)?

Help on any of the questions is appreciated.

Chris

crystal_Imprezav · 07-01-2006, 11:51 AM

Tap the front sensor on your uppipe since the rear one is pretty much useless and does nothing but verify there are two different mixtures to make sure your cat is working. Tapping into it will not do anything to effect the ecu, it is not drawing power from it but senseing it. I would tap it at the sensor since that can always be replaced cheaper than a harness, make sure you dont use one of the cheap plastic tap connectors b/c it is very hot near the uppipe and that will probably melt. Also make sure your use some heat shrink there to protect it from water and heat.

CFar · 07-02-2006, 03:01 PM

Quote:

Originally Posted by crystal_Imprezav

Tap the front sensor on your uppipe since the rear one is pretty much useless and does nothing but verify there are two different mixtures to make sure your cat is working. Tapping into it will not do anything to effect the ecu, it is not drawing power from it but senseing it. I would tap it at the sensor since that can always be replaced cheaper than a harness, make sure you dont use one of the cheap plastic tap connectors b/c it is very hot near the uppipe and that will probably melt. Also make sure your use some heat shrink there to protect it from water and heat.

Great info. One last question:

Is the front O2 sensor a 1 or 5 volt sensor?

Thanks,
Chris

crystal_Imprezav · 07-05-2006, 05:39 AM

1 volt only widebands are 5 volts.

subaru222 · 07-08-2006, 07:08 PM

ok i just did it and still not working the blue wire is wrong

subaru222 · 07-20-2006, 11:46 AM

bump please

JT's06sti · 07-22-2006, 09:10 AM

what isnt working? the gauge itself or the reading, make sure your ground and power are connected and making a solid connection, that was my problem hooking them up...make sure you have the power to the gauge and its grounded before vconnecting the reading part by seeing if its lighting up when your ign and lights are on...after thats a yes, then connect it

subaru222 · 07-24-2006, 01:50 PM

just not moveing i hook it up right to wonder what wrong its a megan air fuel gauge also my egt is lights up but also not moveing but hook up right how do you have your all hook up

06-28-2006, 12:23 PM	#1
CFar Grassroots STI Racer Location: NOVA Posts: 534 Join Date: Jun 2006 Trader Rating: (1)	How do I: Install the O2 wire for an AFR gauge? I picked up a boost gauge and have that hooked up all well and done, but I also picked up a narrowband AFR to fill in the extra spot of my pod (the AFR was inexpensive). I'll pick up the real deal wideband if I decide to go in and start dealing with the engine, but this is just something cheap and easy to fill a void. In any case, where do I find the wires for the O2 sensor to tap into, and which ones do I tap into? Thanks, Chris This ad is not endorsed by this member. Please register or login to hide this ad.

07-24-2006, 01:50 PM	#11
subaru222 Professional STI Racer Car: 07sti 99rs Fav Mod: stock, Location: so cal 909 Posts: 660 Join Date: Apr 2006 Trader Rating: (3)	just not moveing i hook it up right to wonder what wrong its a megan air fuel gauge also my egt is lights up but also not moveing but hook up right how do you have your all hook up This ad is not endorsed by this member. Please register or login to hide this ad.

06-29-2006, 03:24 PM	#2
CFar Grassroots STI Racer Location: NOVA Posts: 534 Join Date: Jun 2006 Trader Rating: (1)	Anybody know? Its just one green wire that needs to tap into the O2 sensor.

06-30-2006, 10:42 AM	#3
crystal_Imprezav Spec C Club Car: Slow 05 STi Fav Mod: Loping Idle Location: Chewy's Garage Posts: 1,861 Join Date: Mar 2005 Trader Rating: (11)	Tap into the Blue wire, its the +signal wire. The two black wires are for the heater and the one white wire it the signals ground.

07-01-2006, 06:10 AM	#4
CFar Grassroots STI Racer Location: NOVA Posts: 534 Join Date: Jun 2006 Trader Rating: (1)	Cool. Next round of questions: 1) Do I tap the rear or front O2? This sensor reads from 0-1 volt 2) Where is the best place to actually tap the sensor? Back at the sensor itself or somewhere near the ECU? 3) If I tap the sensor, will it draw too much current, volts, wattage (not sure on electrical terminology) away from the sensor and change the readings that the ECU is seeing, therefore changing the programming (ECU add/remove fuel/timing)? Help on any of the questions is appreciated. Chris

07-01-2006, 11:51 AM	#5
crystal_Imprezav Spec C Club Car: Slow 05 STi Fav Mod: Loping Idle Location: Chewy's Garage Posts: 1,861 Join Date: Mar 2005 Trader Rating: (11)	Tap the front sensor on your uppipe since the rear one is pretty much useless and does nothing but verify there are two different mixtures to make sure your cat is working. Tapping into it will not do anything to effect the ecu, it is not drawing power from it but senseing it. I would tap it at the sensor since that can always be replaced cheaper than a harness, make sure you dont use one of the cheap plastic tap connectors b/c it is very hot near the uppipe and that will probably melt. Also make sure your use some heat shrink there to protect it from water and heat.

07-05-2006, 05:39 AM	#7
crystal_Imprezav Spec C Club Car: Slow 05 STi Fav Mod: Loping Idle Location: Chewy's Garage Posts: 1,861 Join Date: Mar 2005 Trader Rating: (11)	1 volt only widebands are 5 volts.

07-08-2006, 07:08 PM	#8
subaru222 Professional STI Racer Car: 07sti 99rs Fav Mod: stock, Location: so cal 909 Posts: 660 Join Date: Apr 2006 Trader Rating: (3)	ok i just did it and still not working the blue wire is wrong

07-20-2006, 11:46 AM	#9
subaru222 Professional STI Racer Car: 07sti 99rs Fav Mod: stock, Location: so cal 909 Posts: 660 Join Date: Apr 2006 Trader Rating: (3)	bump please

07-22-2006, 09:10 AM	#10
JT's06sti Senior STI Driver Car: 06 sti Fav Mod: METH!!!! Location: Derry, PA Posts: 364 Join Date: Jun 2006 Trader Rating: (5)	what isnt working? the gauge itself or the reading, make sure your ground and power are connected and making a solid connection, that was my problem hooking them up...make sure you have the power to the gauge and its grounded before vconnecting the reading part by seeing if its lighting up when your ign and lights are on...after thats a yes, then connect it