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The flashing light is telling the driver the problem is serious enough to damage the catalytic converter.
You need to get the engine computer scanned for trouble codes to proceed.
You may have a sensor malfunction. Have a mechanic run the codes and see if there are any stored in the computer. Just because the engine runs OK now does not mean it will continue to do so. The reason the light goes off after the vehicle has set over night may be due to the vehicle not sensing the issue after the long passage of time, until you begin driving again.
Hello! The Drive-Cycle is as follows...Check engine light off, codes cleared; cold start...Warm up engine 5 minutes...Drive (w/ steady throttle) at a steady speed between 40 and 60 mph for 8 min...Stop and idle 3 min...Drive (w/ steady throttle) at a speed above 20 mph for 2 minutes...Turn key off, leave off 10 min...
yes the egr could be clogged or loosing vaccum check the valve by taking it out or looking to see if the pickup tube on the valve is bad or has a pin hole in it.
i would check your ignition system. you would need a meter for this but look for broke or loose connections. if it was a fuel problem i dont think it would just start up after 20 minutes. or you might try your ignition switch. if its shorting or something then ya well it would cut your engine off real quick
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