1996 nissan sentra gxe, code p0400 keeps coming up after changing egr valve and sol.
It may be that the passage to the exhaust is blocked also.
You need to check the passages from the egr valve to the intake to see if there is excessive carbon buildup thereby blocking the passage to the intake. The principle is that when the test for the code runs it is to determine if the egr system is operating correctly. It opens the egr valve to lean out the fuel mixture an so determine if the system is operating correctly. If the code is for electrical operation of the valve it will be an electrical issue
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