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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 11-02-2013, 06:56 PM   #15
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Originally Posted by jordanrw260 View Post
That is correct, the only thing I noticed that the shop did was put the primary o2 in the secondary o2 spot on the borla and then plugged the original primary o2 spot. Now the secondary is behind the cat on the front pipe.
I would definitely put them in the correct spot. The primary o2 is what tells the engine how its running, and the secondary checks to make sure the cat is doing what its supposed to be doing. having them swapped is not a good idea
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Old 11-02-2013, 07:19 PM   #16
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I would definitely put them in the correct spot. The primary o2 is what tells the engine how its running, and the secondary checks to make sure the cat is doing what its supposed to be doing. having them swapped is not a good idea
Let me restate what I said just to make sure I am clear and not causing any confusion

the "secondary" o2 sensor is sitting in the front pipe right after the HFC. Currently with the o2 spacer being used.

The "primary" o2 sensor is still in the borla header, but its sitting in the hole on the side of the header and not the hole that would be facing the front of the car. That hold on the front of the header is plugged up.
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Old 11-02-2013, 07:33 PM   #17
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Originally Posted by jordanrw260 View Post
Let me restate what I said just to make sure I am clear and not causing any confusion

the "secondary" o2 sensor is sitting in the front pipe right after the HFC. Currently with the o2 spacer being used.

The "primary" o2 sensor is still in the borla header, but its sitting in the hole on the side of the header and not the hole that would be facing the front of the car. That hold on the front of the header is plugged up.
you need to put the primary in the hole facing the front i believe
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Old 11-02-2013, 07:39 PM   #18
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you need to put the primary in the hole facing the front i believe
Both o2s should be in the header
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Old 11-02-2013, 07:47 PM   #19
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If both o2 sensors are in the header, then its a sure CEL since my only CAT is in the front pipe.
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Old 11-02-2013, 07:51 PM   #20
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If both o2 sensors are in the header, then its a sure CEL since my only CAT is in the front pipe.
you need to put the primary towards the front of car header hole, and put the other + an 02 spacer on the side header hole

with the 02 spacer you dont need a cat, and you wont get a cel
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Old 11-02-2013, 08:27 PM   #21
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So all the cash I paid for this shop to put the 2nd o2 behind the cat was all a waste? How depressing.
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Old 11-02-2013, 08:45 PM   #22
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So all the cash I paid for this shop to put the 2nd o2 behind the cat was all a waste? How depressing.
unfortunately yes.

you only needed the 02 spacer and you were fine
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Old 11-02-2013, 10:08 PM   #23
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I know you are happy with the unichip, but honestly you should get a real tune. Sell your unichip and buy an openflash tablet...disable the CEL...and make way more power.

my .02
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Old 11-03-2013, 06:19 AM   #24
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OP, do you know how your shop went about relocating your secondary O2 sensor? Did they have to extend the wires? I was thinking about going this route, but leaving the primary O2 sensor where it was.

While you definitely should pull the code to be sure, I'm hoping your CEL is being caused by the primary O2 sensor not being in the right spot.
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Old 11-03-2013, 08:55 AM   #25
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I wonder if I remove the spacer everything would be fine then?
If you have the secondary sensor, I'd remove the spacer. It's not needed if you extended the wires to the secondary O2 in the front pipe. (In theory)
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Old 11-03-2013, 11:18 AM   #26
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Originally Posted by PantsDants View Post
OP, do you know how your shop went about relocating your secondary O2 sensor? Did they have to extend the wires? I was thinking about going this route, but leaving the primary O2 sensor where it was.

While you definitely should pull the code to be sure, I'm hoping your CEL is being caused by the primary O2 sensor not being in the right spot.
The wires had to be extended for the secondary o2 to be placed behind the HFC on the front pipe.

Thanks everyone for the advise so far. I will go out today and try to get the code and report back later with the results. Hopefully once I have that it will be a clearer decision on what to do next.
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Old 11-03-2013, 12:46 PM   #27
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Went to O'Reillys, only a generic code of "P219A" was given. :-(
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Old 11-03-2013, 01:10 PM   #28
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Went to O'Reillys, only a generic code of "P219A" was given. :-(
P219A : Bank 1 Air-Fuel ratio imbalance
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