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po303 is cylinder 3 misfire. I would start with cylinder #3 spark plug wire, look very carefully for chafed, worn or cracked spark plug wire, then check spark plug itself. If it is still acting up do a compression check on cylinder #3 to see if head gasket leaking.
If all that looks okay it may be the #3 fuel injector failure.
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What does the code PO303 indicates and how you fix it?
Misfire on cylinder #3, not sure of the cause (no spark, blown gasket, injector problem).
2001 Chrysler town and country check engen light code po300 po303 po306?
po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected
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PO303 , misfire engine cylinder # 3
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PO303 indicates a misfire on cylinder #3. Normally caused by bad spark plug or plug wire.
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