Question about 2004 Dodge Caravan

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I have code 406 what does it mean?

I have obd code ,171, 406, 138 an my caravan gets hard to start after i shut it off for more than 20 minutes?

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On youe veicle you have to follow procedures to check O2 sensors
voltage to high more than 3.7 volts
circuit shorted or O2 sensor is no good thats for code 138
code 171 contaminated O2 sensor
406 is your EGR system shorted open thats whats probably causing your O2 sensors to contaminated fix the EGR and clean passage way to intake

Posted on May 08, 2010

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The service manual does not list P0751 as a valid code for your vehicle. You may want to re-check it to make sure you are reading it correctly. Also note that many generic OBD code readers cannot give complete renderings of "manufacturer-specific" codes. You may be getting this code if you are using a generic OBD code reader because there is a manufacturer-specific code present and P0751 is the closest "generic" rendering of the code that the code reader could find.

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http://www.obd-codes.com/p0601

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