Check Engine Light Due to Failed Engine Timing Valve on Acura RSX

The Check Engine Light may illuminate because the hydraulic valve that controls the engine valve timing stops functioning correctly. A failed engine timing valve will require replacement.

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Average mileage: 72,500 (64,000–81,000)
4 model years affected: 2003, 2004, 2005, 2006
8 people reported this problem
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problem details
Check engine light and mantainence light comes on and off. I got a PO661 posible problem but don't know what it means or could be.
2004 Acura RSX 81,000 mi,
Check Engine Light comes on intermittently since 60000 miles. Sometimes it is off for a few weeks, but always returns after a while, and then disappears again for some time.