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I discovered that my o2 sensor plug had fallen out one day so bought and installed a new one, this fixed the wrx boxer like engine sound coming out of the exhaust and temporarily turned off the check engine light. Unfortunately this only lasted for a couple miles of driving before the sound and CEL returned. I've made sure to tightly secure the plug but every time I start the car up it sounds fine for 5-10 minutes then the engine starts making the noise again.
I'm not entirely sure if I should be driving my car with the engine performing like this. When stopped it idles low enough to the point where it starts to shake briefly then picks back up. The CEL also switches from just staying lit to flashing. Is this a problem not related to the o2 plug? Anyone have any ideas on what it could be?
I'm not entirely sure if I should be driving my car with the engine performing like this. When stopped it idles low enough to the point where it starts to shake briefly then picks back up. The CEL also switches from just staying lit to flashing. Is this a problem not related to the o2 plug? Anyone have any ideas on what it could be?