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Posts Tagged: EGR codes

P0400 Nissan Altima

Fix code P0400 Nissan Altima Exhaust Gas Recirculation Flow Malfunction Owners of 1999 Nissan Altima 2.4L and 2000 Nissan Frontier 2.4L vehicle may encounter a P0400 Nissan Altima with a check engine light. Owners may also notice an engine stall at idle when the vehicle is warm. Before you start replacing parts, learn how the system works and test each component according to this procedure. Start by checking the rubber hose that goes to the bottom of the EGR back pressure transducer. The transducer measures the amount of “backpressure” in the … Read More

P0401 EGR insufficient flow – Chrysler Minivan

Fix trouble code P0401 egr insufficient flow – Chrysler Minivan Late model Chrysler Minivans are known to post P0401 egr insufficient flow codes P0401-P0408. The egr valve is like an electronic solenoid that pulls the pintel off its seat. A position sensor at the top of the valve measures how far the pintel shaft has actually moved versus how much the computer commanded it to move. It’s the position sensor that goes bad (see plunger in photo). The problem may be in the sensor, but the fix is in replacing the … Read More

P0405, P0406 – Ram, Jeep

Fix trouble codes P0405, P0406 – Ram, Jeep Dodge has disclosed a problem with P0405, P0406 on some 2006-07 Ram Trucks and Durangos and Jeep Grand Cherokees and Commanders. All of these vehicles were built before 2-15-07 and may light up the “Check Engine” light and store P0404, P0405, or P0406 EGR position sensor codes. Check the EGR with a scanner, but chances are the codes are “false codes: due to a programming error in the PCM. The fix involves reflashing the PCM with software release 7.03 SP1 or higher. … 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

Ford DPFE sensor and EGR System

Fix a Ford DPFE EGR sensor problem The Ford DPFE and EGR systems are unique and you must understand how they work if you want to diagnose and fix them. This article explains how DPFE works with the EGR system on Ford vehicles. Car makers recycle exhaust gas back into the engine to reduce combustion temperatures and pollutants. However, in order to make the engine run smoothly car makers have to meter the recirculated exhaust, injecting it into the intake manifold only under the proper conditions. To do that, they … Read More


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