I have had a private garage replace the spark plugs and wires last year and noticed performance improvements. This spring I had them replace the engine ignition coils. All were with fully certified after market parts. Almost immediately my engine light came on. Worried it was something big I went straight to Mazda. There charged me 100 dollars to say it was an engine misfire replace plugs, wires, and coils. I said have you looked! All are new. They then insisted that non Mazda parts were not good enough specs and this was the problem. Is there any merit to this?
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