Q: What would you estimate the cost would be for a valve job on this car on 2002 Mini Cooper

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I ran a compression test on all cylinders and #4 is half the amount of the other 3. Check engine light is on with a code of P0304.

Thanks for any advice

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