I used to think those cheap scan tools from the parts store were a total waste of money.

My neighbor, who works on semis, saw me struggling with a check engine light on my personal truck and said, 'Man, that $80 basic reader can at least point you at the system, saves you an hour of guesswork.' I borrowed his and it gave me the P0302 code, which led me straight to a bad coil pack. What's the cheapest tool you've bought that actually saved your butt on a job?

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