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Thread: Scan Code: P306
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Old 08-28-2019, 10:03 PM   #4
lug
Member
 
Brand: Thor Motor Coach
Model: ACE 32.1
State: Michigan
Posts: 85
THOR #11442
A cracked plug will give you that code. Don't forget to replace the boot and use dielectric grease. The boot will get a carbon trail from the high energy being discharged through the crack. My #3 plug failed, 3.5L EcoBoost, at 62,000. Click image for larger version

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