My son's S60 turbo (it's the one with the larger engine, high-pressure turbo, 265hp) started running rough on Saturday. He ended up driving it 90 miles home. It was rainy weather so I just figured something was wet. On Sunday morning I discovered that the #3 spark plug was loose in the hole and when I removed it, both electrodes were missing. Went to the parts store and got a single plug, and it ran fine after installation. Engine runs and sounds fine. What potential damage should we be looking for? Should he take it to the dealer for evaluation? Thanks.
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