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Q: last year my 2005 toyota avalon check engine light came on.code#p0303.plugs and on 2005 Toyota Avalon

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#3 coil was replaced.After repairs car ran very good,after about 10k the same thing happened check engine light came on code#p0303.The same repairs were made #3 coil and plugs.Again after a few week the light is on Code p0303.What is realy going on wiht this car anyone know ?Please anyone experience this let me know thanks.
(2) Answers
Suspect moisture contamination on # 3 cylinder in the spark plug well. Should be obvious when coil and plug boot are removed!
If this is the case find source of moisture. This is a firewall facing cylinder, poss rain or leaking coolant hose.
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