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Hello I'm Brandon - Volvo tech.
P300, P301 and P302 measn there is a misfire on cylinder 1 and 2.
This is misfire trouble code and the necessary repair is to replace all the coils and spark plugs. This is my recommendation.
Once the coils are replaced the issue will be fixed. Each coil from Volvo is about $75.
Please rate me positive, Thank you.