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Engine Light Codes

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Old 06 Mar 2005, 12:42 pm
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Location: Dayton, Texas, USA.
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Default Engine Light Codes

Does anyone know what the codes P104, P1684, P0401 mean. Car runs good. 2001 98,000 miles Thanks
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Old 06 Mar 2005, 12:48 pm
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Old 06 Mar 2005, 03:55 pm
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Join Date: May 2003
Location: South Bend, IN.
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P104 is not a good code.
They are all 4 numbers following the computer designation.

P1684 after 2001 means a system readiness test. Not all readiness tests have been performed. This means at least one of the many drive cycles didn't finish.

P0401 means you need a new EGR valve assembly.
I've replaced 4 EGRs on PT Cruisers in the last month. It's a common fault. Parts & labor are right at $100.

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