I have PO 401 code in my towncar 05. What 's the problem? http://freeautomechanic.blogspot.com/2006/12/code-po401-insufficient-egr-flow.html
codes 308 and 401 lincoln Navigator 2003 V8 4x4 cylinder 8 misfire , possible coil or plug, 401 egr code , possible dpfe sensor
code 401 come up in your article I would have told you about my experiences. Glad you found it. Basically the EEC knows it is short on vacuum but blames the electrical parts instead of carbon problems
...Code 401 results when the supply port for the EGR is full of carbon. The onboard diagnostics blame electric valving for not opening the flow when in fact the flow is stopped by carbon before the ...
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