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Check engine light on - tech found po303 code and said #3 plug needed replacement. Should I replce all six plugs?

Engine ran rough and had check engine light come on - tech said #3 plug was bad and needed replcement - should I replace all of them?

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For the cost i would,if one when bad they other one
might not be that far.

Posted on Apr 20, 2009

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How many miles on the plugs and truck, what engine/year? If one plug is bad, yes, I would change all plugs. Put the best plugs in you can afford, as they will last the longest (platinum plugs). I questioned the year and engine, because if this was a very old or very high mileage vehicle with engine issues (example, high oil consumption) I would give a different answer. (just replace the one plug in that case, and not a high priced platinum plug)

Posted on Apr 20, 2009

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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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