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What could cause the D4 light on the dash board blink slowly on a 2009 Honda Accord? If I turn off the vehicle and restart it, the light doesn't flash, but I did see it start flashing while driving.

I ran a OBDII scanner, Memoscan U581 and it told me the fuel system, oxygen sensor, etc are all ok, it didn't give any DTC error codes.

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Fuel system on a petrol 2009 honda accord

fuel pump
fuel filter
relay
injector rail fuel pressure regulator
injectors

What could cause the D4 light on the dash board bl - 26347482-ienhbta22ii2alptronxtyf0-3-0.jpg

Posted on Nov 09, 2016

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