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#1
01-29-2005, 01:13 PM
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Unknown Powertrain DTC???
P1406 Unknown Powertrain DTC (Manufacturer Controlled; Auxiliary Emission
Controls) ^^^I have no idea what that means! I checked alldatadiy and it says it's something about the EGR valve. What's up with this message? I don't understand where the problem is. 
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#2
01-30-2005, 10:17 AM
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Re: Unknown Powertrain DTC???
The EGR valve probably needs cleaning.
There's advice on it here . . . http://www.howardm.net/dred98/underhood.php
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