Hi, have you scanned the vehicle to see why your check engine light is on? IF no, you need to. Toyota/Lexus computer system illumniates both engine light and VSC lights whenver a fault occurs in either unit. VSC or stability control is like trac-control or ABS braking system. Get car scanned and make sure all computers are scanned for additional codes, repair them first reset lights and test drive. ON a side note, fixing check engine light will usually take VSC light away also, however sometimes the VSC system will glitch out and a Steering Angle relearn is necessary, it takes about 3mins to perform and a good quality scan tool with 2004 current software. Good Luck.
I went to Auto Zone and they said minor gas vapor leak., after they hooked up the meter to the connection under the dash...and suggested gas cap. Put on new gas cap and lights still on. Do I need to disconnect Battery cable to reset them? The car really doesn't run differently than before, that I can notice
Did they try to reset codes? If yes you may need access to a better quality scanner, you may also have a VSC active code like the one i described above. IF you want to in the meantime disconnect battery negative cabel end and let sit for 15 mins, if lights reappear find someone with a better scanner to scan both engine and VSC/ABS systems for same/new codes. The gas cap theory works sometimes however Toyota/Lexus uses a sohpisticated emissions control system which is very sensitive to small leaks in emission hoses and componets. This will most likely not cause any problems driving or performance isssues, however it can have an effect on fuel economy, not much but some. Repair shops and dealers uses high tech scanners and emission smoke test units to locate source of leaks, its expensive and sometimes the leaks are almost impossible to find. Disconnect battery, drive for a few days, and see what codes if any back, just make sure the VSC system gets scanned also.
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Check your fuses. That was my problem. Hope this helps.
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I disconnected battery cable(neg) for about 15 mins and then put it back on. Lights are off now, and car idled kind of rough at first, but then after driving about 20 miles, seemed to have smoothed itself out. So far so good. I am aware light may come back on, but not after driving about 35 miles so far
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