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Yes the O2 sensor preheater problem will turn on the VSC light, see the complaint often, why? don't know .P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1 In most cases the O2 being replaced cures the code but here is the full story. Possible causes- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit open shorted to ground - Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection - Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit - Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit fuse - Faulty Engine Control Module (ECM)
As the car ages the 02 sensors can clog and need replacing, however check your gas cap first to be sure it is tightly secured. If they are fouled, the 02 sensors will trigger the check engine lights and vsc lights to come on. An exhaust leak can also give a misread. The problem code will identify the suspect are and depending on location this can be as easy a fix as changing a spark plug, but you will have to find someone with a code reading device to determine what area is the problem. On occaison you will also have a sticking throttle body mechanism at the back end of the large rubber sorkle under the hood. This area has a butter fly valve like an old carb which can stick and cause idling issues as well. You can sremove the snorkel and look inside to see the mechanism, then spray clean with carb cleaner while idling. Changing one 02 sensor may cause the VSC light to come on again as the system readjust your fuel ratio mixture. Be patient and pay attention to the readings before changing all the sensors randomly.
you most likely have an "air gap" or "tone ring" problem with one of your sensors or tone rings. i would suggest letting a technician diagnos which problem it is, as it is a diagnosis that requires some experience.
My 2000 Lexus GS 400 just had the VSC/VSC off light and the check engine light come on. I would have to push the accelarator peddle all the way down to get it to go. Took it to the Toyota dealer and the code pulled up as the Throttle Position Sensor was out. Purchased one and having it put in. Will update if this fixes the problem.
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