2013 Forester is throwing a PO351 code and shaking
What is your question?
already replaced spark plugs and engine coils. When code is reset by unplugging and plugging in the battery, the car drives fine for about 40 miles and then throws the PO 351 code, check engine light, and shaking starts again.
What makes this problem better or worse?
worse after driving for approx 40 miles
How long has your 2013 Subaru Forester had this problem?
Just bought the car a week ago and started day 2 of having it.
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Hi, Lisa! This is Bo, an auto expert on RepairPal's Car Genius team!
Even though you’ve replaced the spark plugs and coils, I’d recommend taking a close look at the wiring and connectors for cylinder 1’s coil. Sometimes, a loose connection or damaged wire can cause this intermittent problem, especially if it shows up after driving for a while. There should be a brown and white wire present where the coils plug in.
Also, check the Powertrain Control Module (PCM) connections; heat can sometimes cause intermittent faults there. If everything looks good, it might be worth having a professional scan the system in real time to pinpoint the issue.
One more heads-up: Subarus can be finicky after disconnecting the battery. Make sure to let it run and reset it's idle before driving it
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