Nothing.
This car is very simple and functional. I've had no problems so far. Very easy to maintain. Don't plan on going off roading or race other cars with the CRV, its not a performance car. The CRV is a good all round car for normal paved road driving. It drives and feels like a regular passenger car, but still has the usefulness of an SUV.
I own a 2003 CRV EX 4WD. I've used it to travel some of the roughest, rockiest mountain roads that west Texas has to offer. It may be that this vehicle wasn't designed for such roads, but my car and I are living proof that the CRV has 'been there, done that.'