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O2 Sensor Check Engine

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Old 11-02-2010, 03:31 PM
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Alopez0630
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Default O2 Sensor Check Engine

I used to have an 01 GT and when i installed the new exhaust i got the check engine light . I was able to clear the fault with the diablosport and it never came back . I now own an 09 gt/cs and i did the same thing but the check engine fault for the o2 sensors keeps on coming back on a daily basis after being cleared. ANy ideas?
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Old 11-02-2010, 04:49 PM
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BigDinTexas
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What is the code? Does it specify which one is faulting? Do you have any mods on your '09?

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Old 11-02-2010, 06:10 PM
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Alopez0630
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I cant recall , i can get the exact codes by tonight . i believe its bank 1 .Yes i do . I have a throttle body , CAI, Under Drive Pulley, Long TUbe Headers , X pipe to Magnaflows,Short Shifter, and the Diablosport.
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Old 11-02-2010, 08:42 PM
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SpartaPerformance
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If it's code 2195 or related you may have an issue with the tune and your longtubes. It's federal law that rear O2's can't be turned off so the extra flow from the long tubes sets off a code.
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Old 11-03-2010, 12:11 AM
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Alopez0630
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latest codes i just got from tonight are p0155 o2 heater cirecuit bank 2, sensor 1 n p1000 obd system readiness test not complete
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Old 11-03-2010, 08:58 AM
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Nuke
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Unless you're tune turns off the rear O2's, then you'll throw a code.
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Old 11-03-2010, 09:22 AM
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Alopez0630
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The diablosport doesnt have that options , any ideas?
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Old 11-03-2010, 09:36 AM
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A user can't turn the O2 sensors off with a Diablo OR an SCT. You need a revised tune. Contact your tuner or call AM or Brenspeed if you didn't get custom tunes from them.
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Old 11-03-2010, 10:04 AM
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Originally Posted by Alopez0630 View Post
latest codes i just got from tonight are p0155 o2 heater cirecuit bank 2, sensor 1 n p1000 obd system readiness test not complete
If the heater circuit is open in that sensor or its wiring, you'll keep getting the codes. Once it's warmed up and running, the O2 sensing is probably functioning OK, but the warm-up time will be out of spec and your emissions during that time could be too high. It may be that this warmup time has been reduced since your other car's emission control parameters were certified (back in late 1999 or early 2000). I don't know if heated sensors were even required for the 2001 model year.


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