next time you start your vx up watch for the CEL to come on, it should flash on when you first hit the ACC mode then go out after a second or two, if not its probably burned out

dont know if this is true of all vehicles.. but my buddys jeep used to throw a CEL weekly, and it would go out after a few days (intermittent sensor problem) but even when the CEL wasnt on, the code would stay on the computer until it was cleared out by battery disconnect or obdII scanner,

i asked a guy at the local autozone about it and he said that the CEL comes on as a result of a one time problem and the code is stored, after whatever the time period is of the problem not repeating, the light will go out but the code will be there.. makes sense to me kinda

like it was mentioned before, start with a fuel filter, mine was NASTY when i bought my vx with 40k.. run some fuel injector cleaner through.. check your air filter.. its always the small things