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#2: 12-10-2012, 12:07 PM
Title: Senior Member
Car: 02 Legacy / 08 BMW 535i
Posts: 339
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P0420 normal fix fOR this is to install a o2 anti fouler after the cat then reset check engine light.

Piston slap is normal at cold start change your oil... I use 10w30 high mileage.

Try doing a tune up first and see what happens