Quote:
Originally Posted by turboxpk
Got P0016 on 3/21/17 at about 38k miles, did not notice other problems, engine seemed working fine. Took it to the dealer, they said Toyota was involved in diagnosing the problem and suggested to replace cam timing gear and ECU. Got the car back on 3/30/17, CEL gone. Drove it for a 3-hour trip from PA to OH, noticed white smoke from the hood, pulled over and found oil spilled underneath the engine on passenger side. Also spotted a metal piece lying on the engine cover with oil. Drove it to the nearest dealer (fortunately, it was only 15 minutes away), found a cracked valve cover...
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If it wasn't a rocker arm, it is likely your cracked valve cover came from someone getting sealant into a "blind hole" of a valve cover bolt.
When the bolt was tightened, it created enough hydraulic pressure to snap off a chunk of the back side behind the end of the hole.
That part was eventually picked up by the cam and pushed through the valve cover.