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EGR Valve is located between the exhaust manifold and the intake manifold, which diverts about 15% of exhaust gases into the intake manifold to reduce the Oxides of Nitrogen produced during the combustion process.
run the fault codes to find the problem . Guessing and changing items just costs money and becomes frustrating. With the engine light on it could be more serious than plugs and coil
the engine light on means your car has the obd2 code problem you need to check out the code and delete it, i know this tool is helpful for your car, or you can take your car to toyota dealer to read out the code.
You should get the problem code ran at a shop or auto parts store. My moms 2003 Toyota Echo check engine light came on and it had a slight misfire, I replaced all the sparkplugs about $20 and no check light.
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