For what they cost these are a good investment. Even if you don't have the ability or tools to fix the problem if you know what the problem is that can save time and money at a garage. I had a coil pack go on mine not long after I bought the car, no way of knowing which but the code reader told me the cylinder that was misfiring, luckily I had a spare coil pack and I had replaced it and I was on route in 15 mins.
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