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Old 03-21-2011, 10:13 AM   #1
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DTC P0403

Any suggestions on what I should try first?
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Old 03-21-2011, 12:36 PM   #2
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Re: DTC P0403

whats the code say (in reference to) we have a trouble code list on the forums, see what that says first
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Old 03-21-2011, 02:23 PM   #3
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Re: DTC P0403

It's not on the list. I will have to run it again and see what it says, I am at work right now, i don't remember exactly what it said.
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Old 03-21-2011, 02:33 PM   #4
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I'm about to get on the road dude. Sounds like evap. Just google dtc p0403. Let us know. Evap or egr. I think.
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Old 03-21-2011, 02:33 PM   #5
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Re: DTC P0403

A quick google search showed it as a EGR Flow Circuit Malfunction
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Old 03-21-2011, 02:39 PM   #6
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Dpfe sensor?
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Old 03-24-2011, 02:44 PM   #7
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Re: DTC P0403

I hooked it up and it says P0403 Catalyst System Efficiency Below Threshold (Bank 2). I don't have cats, I never had since I have bought the car, never had this code. O2 Sensors are working. What else do I need to check?
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Old 03-24-2011, 02:46 PM   #8
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Quote:
Originally Posted by 99 SVT Cobra
I hooked it up and it says P0403 Catalyst System Efficiency Below Threshold (Bank 2). I don't have cats, I never had since I have bought the car, never had this code. O2 Sensors are working. What else do I need to check?
Mil eliminators. Light should have been on with no cats.
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Old 03-24-2011, 02:47 PM   #9
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Re: DTC P0403

Yeah i have the mil eliminators.
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Old 03-24-2011, 02:50 PM   #10
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Quote:
Originally Posted by 99 SVT Cobra
Yeah i have the mil eliminators.
Sounds like the bank 2 went bad.
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Old 03-24-2011, 03:15 PM   #11
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EGR solenoid control circuit
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