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Old 10-30-2004, 07:58 AM   #1
Slack
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Join Date: Apr 2002
Location: Atlanta, Ga
Default Custom Headers + No Cat = CEL P0132 and Horrible Gas Mileage

P0132 Front oxygen (A/F) sensor circuit range/performance problem (high input)

I recently made some custom headers for my car and am currently catless (until I can get a highflow cat) and I'm getting CEL P0132. Also, I have less than 1/2 tank and only 130~miles on the trip. Normally I get around 300miles to a full tank. Does anyone know what might be the problem? I drove the same on Borla headers + random tech cat before and never got gas mileage this bad.


Mick
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Old 10-30-2004, 09:32 AM   #2
Slack
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Okay, I figured out that it is most likely a bad front O2 sensor. Problem is that none of the local dealerships have this part in stock right now. Does anyone know a suitable Bosch replacement that I could use instead of the stock subaru sensor?


Mick
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Old 10-30-2004, 03:43 PM   #3
Slack
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I replaced the front O2 sensor. I will see how the gas mileage goes from here.


Mick
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Old 10-30-2004, 11:49 PM   #4
Section 8
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Maybe I should leave you, yourself and him to talk amonst yourselves.

How is the header aside from the fuel milage. What did you end up doing design wise?

cheeRS,

Greg
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Old 10-31-2004, 01:10 AM   #5
Slack
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Yeah, I am the only one who usually replies to my threads.

They are not pretty, but offer slightly more power than my old setup. I am sure that with proper materials and enough time that we (me and a couple of subaru/bmw buddies) could make something that will offer maybe a few more hp over these. The car now sounds like a veedub on crack.

I will be posting a thread about it soon with pictures. They are a ghetto-tastic (bottle on mig ran out of gas, so we had to use flexcore) prototype similar to your's and the MRT style. More to come later.


Mick
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Old 10-31-2004, 01:44 AM   #6
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eh, first pieces are always that way.

Congrats, Sounds good.

cheeRS,

Greg
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Old 11-01-2004, 06:03 PM   #7
Slack
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Okay, the CEL came back. Does anybody have access to a trouble shooting manual (DTC) for certain CEL's? I could really use some help with this.


Mick
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Old 03-12-2007, 06:12 PM   #8
Scootaru
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I am getting the same CEL. I though, have an 04 STI with stock headers. My gas mileage is also horrible.

I notice on my data logs that the ECU is seeing a very lean condition from the front oxygen sensor even though the car is not running lean. It is calling for a positive air/fuel correction, which in turn causes the car to run super rich. My data logs will show an A/F ratio of around ~20:1. The fuel correction #1 is around +25%. My wideband A/F ratio gauge shows ~10:1.

If anyone knows what the problem is, I'd like to know.

Last edited by Scootaru; 03-26-2007 at 04:49 PM. Reason: Corrected inaccurate data.
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