My engine trouble light keeps coming on even hours after I have left the dealership that reset it. Can a regular person find a product that can tell us what IS the problem with out getting shafted by the dealership or repair shop?
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As long as it does'nt stay on it's doing what it's suposed to be doing which is saving you from going out of control. It'll come on more often if you drive like hell, run with low tracktion tires or worn out ones and if the air pressure is low. If your tires have over 80,000 miles on them even if the tread is still good their bad tires as their skating along and the trackstion system is working hard to keep the car under control. If the tires aren't al the same size it'll do it to. ( fronts worn out backs still with tread.) Mis matched tires too. Ifthe light stays on other light's are bound to be coming on too the ABS light the brake light, and even the engine light as their all involved in traction control.
Could be a fuel pump or ignition module problem. Bad fuel pumps dont usually make a check engine light come on. when it wont start have someone beat on the bottom of the gas tank will you try to start it. If that makes it start it is your fuel pump. Have it scanned for trouble codes even though the check engine light is not on you may have a stored trouble code.
Why my Check Engine/Service Engines Soon light comes on? The engine computer or PCM/ECM All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions. The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.
HAVE YOUR CAR HOOK UP TO A DIAGNOSTIC SCANNER TO SEE WHAT CAUSING THE CHECK ENGINE LIGHT TO COME ON.IF YOU ARE HAVING SECURITY PROBLEMS THE DEALERSHIP HAS TO FIX IT.SOME TIMES YOUR IGNITION KEY OR LOCK CYLINDER IS WORN WHERE THE BCM AND PCM DONT RECOGNIZE IT.THINKING ITS A THEFT CAUSING CAR TO SHUT OFF.SEE THE DEALERSHIP HAS TO SEE IF YOUR KEYS IS WORN TO A POINT WHERE THE BCM AND PCM.DONT RECOGNIZE. THE IGNITION KEYS.SO THEY HAVE TO REPLACE THE KEYS ALSO IGNITION SWITCH AND BCM.THEN THEY HAVE TO REPROGRAM THE NEW KEYS AND IGNITION AND BCM TO THE PCM SO THE CAR WILL CRANK UP.THIS IS A DEALERSHIP FIX.