Exhaust Long Tube Headers And O2 Sensor Code

Discussion in 'SN95 4.6L Mustang Tech' started by scottyp, Jun 9, 2014.


  1. scottyp

    scottyp New Member

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    I just got me a 2004 Mustang Gt 4.6L and the guy I got it from put on long tube headers and Borla exhaust. The service engine light is on, it reads P0153 Bank 2 Sensor 1 - O2 sensor Circuit Slow Response. He said it had this code because of the long tube heads, which makes sense. Well a few days ago I decided to hook up my OBDII scanner and now it gives me that P0153 code I previously mentioned but it also gave me a code and I believe it said the Bank 2 Sensor 1 O2 sensor is stuck and another code saying Bank 2 Sensor 1 O2 sensor is running lean. I'm just wanting to know if the o2 sensor is actually the problem or is something else causing those codes? Maybe a vacuum leak or maybe it needs tuned. I'm on a budget and don't want to waste money on a new O2 sensor if that isn't the problem is all lol. Thanks.
  2. Rusty67

    Rusty67 Well-Known Member

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    I believe you need to retune to fix it. I think you need to have these parameters changed in the tune:
    o2 transport delay time, modify time delay for closed loop, modify temp for front hego to go closed loop, and heater duty cycle
    trombonedemon likes this.
  3. Mattstang04

    Mattstang04 Active Member

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    I've always heard a tune was necessary after long tubes. Time to get to the dyno.

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