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Old May 16th, 2020, 05:37 PM   #1 (permalink)
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O2 sensor turbo help

Just got done building my turbo. The last thing I need to do is put a o2 sensor on my downpipe. What do I do with all the o2 sensors? Which o2 sensor goes to the the down pipe? Thanks

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Old May 16th, 2020, 10:46 PM   #2 (permalink)
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Bank 1 sensor one, right after the turbo.


Everything else, wrap the sensor in tinfoil, throw a metal zip tie around them, and hide them away. Fastworks only needs 1 O2 sensor
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Old May 17th, 2020, 01:23 AM   #3 (permalink)
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How to run 1 sensor and no codes lol
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Old May 17th, 2020, 05:25 AM   #4 (permalink)
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Originally Posted by Smokeynbandit View Post
How to run 1 sensor and no codes lol
The downstream ones still need to be plugged in otherwise you get heater codes, but they don’t actually need to be in the exhaust with the tune
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Old May 17th, 2020, 05:31 AM   #5 (permalink)
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The downstream ones still need to be plugged in otherwise you get heater codes, but they donít actually need to be in the exhaust with the tune
My upstream bank one sensor has stripped threads. Can I plug bank 2 sensor into bank 1?

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Old May 17th, 2020, 06:14 AM   #6 (permalink)
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Quote:
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Quote:
Originally Posted by pcfreak4 View Post
The downstream ones still need to be plugged in otherwise you get heater codes, but they don’t actually need to be in the exhaust with the tune
My upstream bank one sensor has stripped threads. Can I plug bank 2 sensor into bank 1?

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I think so, they’re all narrowband O2 sensors, not fancy wideband AFR sensors like my WRX has for its upstream sensor

So they should be swappable, I think the only difference is the amount of wire length
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Old May 17th, 2020, 07:35 AM   #7 (permalink)
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Correct. I commonly suggest people to swap their left and right sensors to test for bad sensors.

You can also lengthen the wires. They're not special fancy resistance wires like some people say. I measured 0ohms across them when I cut them on some bad sensors (burned out heaters)
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Old May 17th, 2020, 09:36 AM   #8 (permalink)
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I still have two of my old oem sensors. I can plug those in for both bank 2 sensors and just ziptie them somewhere and i'll get rid of my heater codes? I still have both of those dead sensors inside the L spacers i got from RRE.
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Old May 17th, 2020, 10:17 AM   #9 (permalink)
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I still have two of my old oem sensors. I can plug those in for both bank 2 sensors and just ziptie them somewhere and i'll get rid of my heater codes? I still have both of those dead sensors inside the L spacers i got from RRE.
If you aren’t going turbo, just leave them in the exhaust stream
Btw with the tune you can set cat efficiency to 100% and take them out of the spacers or just leave them anyway it doesn’t matter really
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Old May 17th, 2020, 01:51 PM   #10 (permalink)
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Under emissions? I only have EGR options.
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Old May 17th, 2020, 05:43 PM   #11 (permalink)
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I still have two of my old oem sensors. I can plug those in for both bank 2 sensors and just ziptie them somewhere and i'll get rid of my heater codes? I still have both of those dead sensors inside the L spacers i got from RRE.
Yes. Just wrap them in foil so they hold heat better and don't burn out as fast
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Old May 17th, 2020, 06:20 PM   #12 (permalink)
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Simple solutions! 😎
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Old May 17th, 2020, 06:31 PM   #13 (permalink)
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In the exhaust stream itself though, no spacers at all, is the nicest. Then the heater checks happen, and the element shuts off again right away. They will definitely last longer in the stream than on spacers or wrapped in foil (or dangling, lol, as I did)
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Old May 17th, 2020, 08:53 PM   #14 (permalink)
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Yeah personally all of mine are in their original spots with the tune just set with Cat Efficiency to 100% to prevent P0421 and P0431 and it works

I messed with spacers before I got the tune and I got lean codes
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Old May 17th, 2020, 09:43 PM   #15 (permalink)
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That makes no sense... Did you put spacers on the upstream sensors too or something? Lol

Downstream won't ever throw a lean code
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Old May 17th, 2020, 11:26 PM   #16 (permalink)
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That makes no sense... Did you put spacers on the upstream sensors too or something? Lol

Downstream won't ever throw a lean code
No
I think the lean code was related to the intake
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Old May 18th, 2020, 02:18 AM   #17 (permalink)
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When i was exploring with my gutted exhaust manifold i placed a spacer on bank 1 sensor 1 along with both number 2 sensors Oddly enough the car seemed to pull like a demon. Was gonna install a spacer on bank two sensor one but read here on the forum that both number 1 sensors dont need spacers...
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Old May 18th, 2020, 06:44 AM   #18 (permalink)
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When i was exploring with my gutted exhaust manifold i placed a spacer on bank 1 sensor 1 along with both number 2 sensors Oddly enough the car seemed to pull like a demon. Was gonna install a spacer on bank two sensor one but read here on the forum that both number 1 sensors dont need spacers...
Yes because the top sensors are used for fuel calculations, putting spacers on them would make the car run super dangerously rich

The whole point is to get the after cat sensors out of the exhaust stream so that they don’t see as much exhaust flow, as if the cats are still there which reduce the readings the same way

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Old May 18th, 2020, 11:10 AM   #20 (permalink)
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Rich wouldn't pull hard. Lean does
I know, but think about it, having the top sensors out of the stream would read lean to the ECU, the ECU would see this lean condition and then make it run rich
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Old May 18th, 2020, 05:16 PM   #21 (permalink)
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Out of the stream, it would read cold, like rich would. So it would pull fuel to try and lean it up, which adds power, but is dangerous to the pistons and valves


Narrowband don't read oxygen, they just work by heat
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Old May 18th, 2020, 07:16 PM   #22 (permalink)
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Out of the stream, it would read cold, like rich would. So it would pull fuel to try and lean it up, which adds power, but is dangerous to the pistons and valves


Narrowband don't read oxygen, they just work by heat
U sure they are just heat sensors?

The heating element is just to help it get up to temp to read properly

I don’t think they just read heat to determine oxygen content, I thought they actually read the exhaust particles
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Old May 19th, 2020, 12:58 AM   #23 (permalink)
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The way I had it explained was that they need to be within a certain heat range first for the resistance value, then hot or cold flow across them will then cause them to adjust their voltage
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Old May 19th, 2020, 06:17 AM   #24 (permalink)
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The way I had it explained was that they need to be within a certain heat range first for the resistance value, then hot or cold flow across them will then cause them to adjust their voltage
I think the heating element just heats it up so it works faster on cold start

The voltage does flop back and forth rich to lean constantly as the ECU maintains stoic

I don’t think the sensor is just a heat sensor though, it actually senses oxygen particles in the exhaust
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Old May 20th, 2020, 07:04 PM   #25 (permalink)
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Can I put bank 2 02 sensor in the downpipe next to bank 1. I get a low voltage bank 2 check engine light.

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Old May 20th, 2020, 07:14 PM   #26 (permalink)
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Can I put bank 2 02 sensor in the downpipe next to bank 1. I get a low voltage bank 2 check engine light.

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Not sure what you’re asking but yes they should be swappable although they all have different wire length
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Old May 20th, 2020, 09:28 PM   #27 (permalink)
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Not sure what youíre asking but yes they should be swappable although they all have different wire length
So all 4 02 are swappable? Downstrean can go to upstream. Just different length of wires?

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Old May 20th, 2020, 10:42 PM   #28 (permalink)
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Not sure what you’re asking but yes they should be swappable although they all have different wire length
So all 4 02 are swappable? Downstrean can go to upstream. Just different length of wires?

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Yes 99% sure
They’re all narrowband as said before
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Old May 20th, 2020, 11:11 PM   #29 (permalink)
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I've suspected that they can all be swapped but never tested it.

Has anyone tested and compared the data? I'd imagine the must read the same for the comparison data
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Old May 20th, 2020, 11:16 PM   #30 (permalink)
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I've suspected that they can all be swapped but never tested it.

Has anyone tested and compared the data? I'd imagine the must read the same for the comparison data
I just cut the wires to make the upstream 02 sensor with longer wires like you said to do.

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Old May 21st, 2020, 11:59 PM   #31 (permalink)
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I'll be swapping the old ones i have and test them. I mentioned before that my two #2 sensors are dead. 0v on them. I'll swap them when i get home and ill check voltage with Fastworks or my Hypertough codereader. It should clear the code, right? Also, what happens to the pistons and valves when running lean with the spacers on both #1 sensors? Im sure our OP is learning alot too.
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Old May 22nd, 2020, 05:36 AM   #32 (permalink)
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I'll be swapping the old ones i have and test them. I mentioned before that my two #2 sensors are dead. 0v on them. I'll swap them when i get home and ill check voltage with Fastworks or my Hypertough codereader. It should clear the code, right? Also, what happens to the pistons and valves when running lean with the spacers on both #1 sensors? Im sure our OP is learning alot too.
Yes clear the codes and see what come back after restarting the engine
Also, for the last time bro, you cannot ever run the top sensors on spacers, ever
You will cause engine damage doing so, too lean and it will heat everything up and could warp something or blow something

Last edited by pcfreak4; May 22nd, 2020 at 05:39 AM.
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