I've got 4 O2 sensors, but my new headers (building up my KLZE) only have 2 holes. Other than tapping new holes, do I have any options?
Can I wire two sensor cables together to piggyback off one O2 sensor?
OBD-II GS with 4 O2 sensors; headers only have 2
OBD-II GS with 4 O2 sensors; headers only have 2
- Gord
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
- solo_ryder
- Senior Member
- Posts: 6289
- Joined: October 16th, 2004, 2:01 am
- Location: British Columbia
Re: OBD-II GS with 4 O2 sensors; headers only have 2
Well, there should be 3 sensor bungs on the OBDII headers, 1 on each primary and on that is near the flex pipe, the other one may be in the cat or after the cat converter. Your best option is to weld a new bung on where the old 02 was located as it seems you got OBDI style headers
Re: OBD-II GS with 4 O2 sensors; headers only have 2
should have 3? why?
stock has 2 sensors per bank
2 sensors are up stream and NEED to be there. the other 2 that are down stream dont bother with.. will throw a code on 96 ecu no mater what.
stock has 2 sensors per bank
2 sensors are up stream and NEED to be there. the other 2 that are down stream dont bother with.. will throw a code on 96 ecu no mater what.
1996 MX-3 GS - rollin' on Rota Slipstreams, (Red, Deep Tint, Black Lip)
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
Re: OBD-II GS with 4 O2 sensors; headers only have 2
Hey Josh,JoshVK wrote:should have 3? why?
stock has 2 sensors per bank
2 sensors are up stream and NEED to be there. the other 2 that are down stream dont bother with.. will throw a code on 96 ecu no mater what.
Are the upstream sensors the ones with 3 wires or 4?
- Gord
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
Re: OBD-II GS with 4 O2 sensors; headers only have 2
the 3 wire.nightfire wrote:Hey Josh,JoshVK wrote:should have 3? why?
stock has 2 sensors per bank
2 sensors are up stream and NEED to be there. the other 2 that are down stream dont bother with.. will throw a code on 96 ecu no mater what.
Are the upstream sensors the ones with 3 wires or 4?
Also 3 wire and 4 wire are almost the same. just ground the white wire in the 4 wire and it would be the same
1996 MX-3 GS - rollin' on Rota Slipstreams, (Red, Deep Tint, Black Lip)
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
Re: OBD-II GS with 4 O2 sensors; headers only have 2
That would explain why I'm running in open loop mode.JoshVK wrote:the 3 wire.nightfire wrote:Hey Josh,JoshVK wrote:should have 3? why?
stock has 2 sensors per bank
2 sensors are up stream and NEED to be there. the other 2 that are down stream dont bother with.. will throw a code on 96 ecu no mater what.
Are the upstream sensors the ones with 3 wires or 4?
Also 3 wire and 4 wire are almost the same. just ground the white wire in the 4 wire and it would be the same
![Smile :)](./images/smilies/icon_smile.gif)
*swaps O2 sensors*
BTW - What did you mean by don't bother with the other 2 sensors? If I tap two new holes downstream (ie. in the downpipe) will the ECU still throw a DTC?
- Gord
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
Re: OBD-II GS with 4 O2 sensors; headers only have 2
unless you get spacers it will still throw a code.. they are just there to monitor that the pre cats are working, so if it reads outside of what it thinks is proper (the values you would get with working precats in) its going to throw a code,... so don't bother with em as you'll get a code either way...
1996 MX-3 GS - rollin' on Rota Slipstreams, (Red, Deep Tint, Black Lip)
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
True Straight Neck KLZE with TB relocate. Custom Cold air Intake. 2.25 Exhaust to Bosal muffler.
ACT Stage 2, Fidanza Lightweight Flywheel, Short Shifter with CorkSport Bushings and SS Clutch Line.
Suspension Techniques Springs On Zx2 Struts. SRD Control arm Bushings, Custom Sway Bar Links
Re: OBD-II GS with 4 O2 sensors; headers only have 2
I didn't know we had pre-cats..JoshVK wrote:unless you get spacers it will still throw a code.. they are just there to monitor that the pre cats are working, so if it reads outside of what it thinks is proper (the values you would get with working precats in) its going to throw a code,... so don't bother with em as you'll get a code either way...
Interestingly enough, I've been running without them for a few days now (100km) and still no code. Sweet.
![Smile :)](./images/smilies/icon_smile.gif)
- Gord
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
1996 MX-3 GS-ZE 2.5L 5spd
KLZE+LSD / Headers / KL02 VAF / Clutchmasters stage-I / Fidanza 9lb flywheel / Eibach Pro Kit / Tokico HPs / Urethane bushings & mounts / SSR Comp-C 16x7 / General Exclaim UHP 205/45R16 / Wilwood 13" brakes / Whiteline rear swaybar / Carputer / Software Crossover / Infinity components+subs / 41hz Tripath Amp9 / Trunk SLA batt / Keyless entry
Re: OBD-II GS with 4 O2 sensors; headers only have 2
So everything is still good with just two O2 sensors and not the lower two, good. If I ever get my headers I'll be able to install my ZE, I'll omit the bottom two sensors as well.
2004 Subaru WRX Silver, stage 2, minty interior.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.