One problem related to check engine light on has been reported for the 2004 Honda Pilot. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Honda Pilot based on all problems reported for the 2004 Pilot.
Dear sir/madam, my 2004 Honda Pilot has 58k miles on it. I scheduled a 60k major maintenance on 3/19/2010. But on 3/18/2010 on my way back home, the check engine light was on, the car got vibration and smoke. I sent my car to the dealer immediately at about 7:00 pm on 3/18/2010. On 3/19/2010, the dealer called me and said the no. 5 spark plug came out and burned out the coil, it's a very unusual situation. I went to the dealer to check the damages: the spark plug only has the metal portion left, the coil burned out and only 1/3 or 1/2 left, the cylinder head got some damage too and some metal chips remained in the cylinder head and cylinder. I did the oil changes and maintenance at dealership regularly and drove the car gently. I don't think this incident is related to my driving style. It has to be quality issue on either the coil or the spark plug. But I am not a mechanics and don't know if this happened to other cars. Although the car is out of warranty (3 years/36k miles), I really think it's a serious quality issue. Honda needs to take care of this issue. I am unlucky, this happened to me, I am lucky, it happened to me not on highway. Hope the authority can do some investigation and urge Honda to resolve this issue. Thanks.