[THEFERMANATOR]

If the tranny was low it could throw a code for slippage. As far as actual fluid level's, that would be a no. Brake fluid though will turn on the brake light in the cluster as the proportioning valve will trip the limit switch if it gets low or air in it. Reading the codes is really your only option to go with. Be careful though of the light when trying to sell it. If it is an OBDII readiness monitor that is throwing it, it will trigger the light after a highway drive. MOST codes will clear themselves after 3 consecutive engine heat cycles without the fault being present. The downstream O2 is famous for driving people nuts with an intermittent check engine light. I don't remember where the ground is at on a 99, but I know they give trouble with the ground for the downstream O2.