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2004 Ford F150 5.4L triton with engine code P0355, change the coil pack and plugs and still showing the same thing

Vehicle: 2004 Ford F150 5.4L triton

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Hi there,

This code is more about a connection issue then an actual faulty coil. If you didn't use a factory coil, the issue may be a result of an aftermarket coil. If the spring inside the coil isn't making a good connection on the spark plug or in the coil you can have this type of issue.
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P0355 FORD - Ignition Coil 'E' Primary/Secondary Circuit

Read more: https://www.autocodes.com/p0355_ford.html

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