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Discussion Starter · #1 ·
i pulled the Volvo out of the garage yesterday for my wife as she was leaving and in the minute or so it took for her to hop in the car's check engine light popped on, went in to degraded performance mode, and it seemed pretty clear that a cylinder was not firing (have experience chasing down coil plugs in an E53 X5).

i pulled out the code reader and got a P0300 P0302.

our local dealer can't take the car in for a week so wondering if:
1. other folks have experienced this and if it's more common than i think (i've seen turbo hose but also... what is apparently the dreaded spark plug crack)
2. if i should just change the plugs myself
3. we should have it towed to the dealer. the super and turbocharging on these has me worried about not running correctly.

thanks in advance!
 

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I would have it towed to the dealer
 
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