spark knock, piston slap, and a po420!
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12-10-2012, 01:07 PM
02 Legacy / 08 BMW 535i
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
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