I installed these to fix an engine over voltage issue (other parts were also replaced). After investigating this issue for some time after installing these coils, I found that 1 out of 4 coils was DOA. This was very frustrating and caused me to buy additional parts (camshaft position sensor, throttle body, spark plugs, etc.) that I probably don't need. I assume this is what you get if you buy parts where the price for four of them is the same as a high quality branded product. Update: Turns out at least two of these were bad. Replaced by new Hitachi. That helped. Too bad I didn't keep the box, otherwise I would have sent it back. I highly recommend spending the money and getting good for this repair.
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