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Posts Tagged: P0401

Air injection reaction pump – Taurus Sable.

Fix Air injection reaction pump – Taurus Sable P1414, P1413, P0401, P0402, air injection reaction pump, AIR, Ford Taurus, Mercury Sable. The P1414, P1413, P0401, P0402 code relate to the air injection reaction pump (AIR). The purpose of this pump is to inject air directly into the exhaust manifold to complete the combustion process. At cold startup, the computer commands a rich mixture. The extra air from the AIR pump oxidizes the extra hydrocarbons and carbon monoxide in the exhaust during this rich mixture period. The AIR pump is active … Read More

P0401 Ford Vehicles

Fix code P0401 Ford Vehicles If you haven’t’ already done so, read the full explanation of the DPFE system posted here. This is a very common code of Ford vehicles and can drive people absolutely crazy. Don’t get sucked into throwing parts at this problem. It’s really a fairly simple system. The computer wants to know if the EGR valve is recirculating the amount of exhaust gas that it instructed it to. In order to check that, the DPFE checks for a pressure change above and below a port. It … Read More


P0401 Insufficient EGR Flow If you have a P0401 Insufficient EGR Flow trouble code, read this to understand what it means EGR stands for Exhaust Gas Recirculation. At high combustion temperatures, the Nitrogen in the air can combine with the air fuel mixture to produce Oxides of Nitrogen–a key component of smog. To reduce combustion chamber temperatures, the EGR valve opens and sends in a ballast charge of exhaust. Because sending exhaust into the mixture at idle would choke the engine, this is usually done when the engine is running … 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

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