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No Check engine light with trouble codes?

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Old 11-19-2009, 06:32 PM
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No Check engine light with trouble codes?

Do not expect any miracles from this, however IMO it is worth the total of 10-15 seconds it takes to pull the plug on it. Doing so will generate two Diagnostic Trouble Codes in the PCM - P0400 (Exhaust Gas Recirculation Flow Error) and P0407 (Exhaust Gas Recirculation Sensor A Circuit Low). Neither of these codes will trigger the check engine light, and can easily be cleared with a tuner, scanner, or by simply unplugging the battery.
I saw this in the EGR defeat sticky and was wondering if I can have trouble codes without knowing it? No CEL and yet have trouble codes? I have an SCT programmer that can read codes but are there active trouble codes that I may not be able to see with my SCT programmer that plugs into the OBD port?
 
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Old 11-19-2009, 07:14 PM
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yes you can have dtcs with no light not at all uncommon.
 
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Old 11-20-2009, 05:17 AM
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The way my truck is running right now there must be some that I don't see with my SCT programmer. How do I get access to them?
 
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Old 11-20-2009, 07:02 AM
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The SCT is NOT a good code reader in any form or fashion. Try an Autozone or Advance Auto if you can't get to a dealership (best place IMHO). I have an OLD predator that I use strictly for code scanning and diagnostics since I don't have Auto Engenuity which may be the next best thing to Ford's IDS.
 
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Old 11-20-2009, 07:16 AM
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I don't believe the parts stores readers will catch the codes either. It didn't for me.
 
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Old 11-20-2009, 09:41 AM
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They will get the standard, my term, codes but not the specialty codes such as abs and tranny. Our Autozone will no longer do code reading for the public. They said it came down from corp. Liability of people buying parts based on the reading and then not correcting the problem.
 
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