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Posts Tagged: P1408

P1408 EGR out of self test range

Fix code P1408 EGR out of self test range If you have a P1408 EGR out of self test range trouble code, this post will help you understand what it is and how to fix it. Exhaust Gas Recirculation valves (EGR) open and close to allow exhaust gas to flow into the intake manifold. The computer commands to valve to open and close in varying amounts. But since this is a mechanical valve, the computer needs to check to make sure the valve actually opened the correct distance. Some manufacturers attach … Read More

P0401 P1408 — Ford

Fix trouble codes P0401  P1408 on a Ford vehicle Fords with P0401,  P1408 trouble code are known for problems with their DPFE sensors. These sensors detect the change in manifold vacuum pressure when the EGR is commanded on and off and display P0401,  P1408 trouble codes. If you get an EGR code, DO NOT automatically assume that it’s a bad EGR valve! Get a hand held vacuum pump and apply vacuum to the EGR. Check the operation of the valve. It if moves properly and the passages are clean, move on … Read More


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