2013 Subaru Forester is throwing a PO351 code. replaced spark plugs and engine coils. Car drives ok for about 40 miles then throws code again and shakes. Seems to stop after disconnecting and reconnecting the battery but then repeats the cycle
What makes this problem better or worse?
it seems to be worse after driving for about 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.
RepairPal Certified shops can diagnose and repair your 2013 Subaru Forester. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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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