Question about 2003 Mazda MPV
The light just came on, but the car is running fine. One of the possible problems is with the emissions devices. Any hints as to which one is most likely or do you recommend I go to the dealer.
Go to a parts store, most will scan for engine codes stored in the cars computer for free. They can tell u what codes are present (write them down for future reference) what they mean, and what could be the problem. It is an indication that there is an emissions problem, and even though the car runs fine, ignoring the warning light could result in more problems and $ down the road if not corrected soon. When u get this free info, u can decide if u want to fix it yourself, go to a private mechanic/garage, or go to the dealer. It's always a good idea to go w/ knowledge of the problem and possible fix to avoid being taken advantage of. Good luck!
Posted on Nov 14, 2008
The best way to find out is to use the onboard ECU (computer) and it will tell you which code. There is a terminal connector for the ECU under the dash on the driver panel side or in some cases under the hood. I havent done much work on the 2003 MPV. You can go to Pep Boys or an autoparts store and purchase the Engine Diagnostics code reader. Plug this into the terminal, turn to On position, and it will tell you all the codes registered. Go online and find out what code# is for what sensor. Or if you have the Chilton book, it may list the engine code#'s. This could be a list of >10 sensors, so you dont want to guess and spend money changing them all. Typically, the sensors to go bad are Air Solenoid valve sensor, temp sensor, oxygen sensor, fuel regulator sensor, distributor or sensor for electronic coil to send the spark.......Some computers, like GM and earlier Toyota's have onboard computer where you use a paperclip and jump two terminals, then turn the key to the on position and the engine light will flash a number of times to reveal the code. If your model has this, then you dont need to buy the diagnostic reader. Once you know the code...then just change the sensor, and disconnect the neg. on your battery to clear the code and reconnect.
Posted on Nov 14, 2008
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Posted on Jan 02, 2017
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The check engine light (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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