I have a 2002 Accord sedan that has shown an engine code. I took it to a local Honda repair shop who said that the code indicated a failure of a Bypass valve and a shut valve, I gave them the go ahead to replace these two valves. This was done last Friday. Sunday morning after driving less than 100km since the work was done the engine light came on again. Having paid 0 for parts and 5 for labour I went back to the repair shop who checked and said it was the same code as before. There explanation now is the fault can travel back up the wire and affect the computer. The offered to locate a used computer but said I would have to take it to the dealership to have it installed as it would have to be programmed to work with the ignition key. Does anyone know what these valves are for ? I feel their explanation is bit of a crock and am feeling I have been taken. Any comments. PL