About a month ago I ran diagnostics from my Fixd app/device which gave me a 0420 code. From this, I replaced my downstream o2 sensor. Things seemed fine again and the check engine light was off. A couple days ago out of nowhere, my car suddenly ran super rough and had no power at all. The check engine light was not only on but FLASHING! I ran diagnostics again to show 0303 code. Ended up the ignition coil for cylinder #3 was bad. Replaced that along with all 4 spark plugs. Again it ran fine on the first time driving it but when I took a short trip later in the day, it was back to the check engine light being on with a 0420 code once again. Could this be happening due to yet another problem not yet addressed or possibly due to something not being done correctly in either of the first two fixes?
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