Rick's Free Auto Repair Advice

Posts Tagged: P0402

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 P0402 Ford Escape

Fix code P0401 P0402 Ford Escape Owners report repeat P0401 and P0402 codes from the differential pressure feedback EGR sensor (DPFE). If you’ve already checked out my DPFE article here, then head right to the muffler. There’s a small drain at the bottom of the muffler to drain off any condensation that accumulates during a cold start. Shops are reporting that the drain can clog and that moisture can damage the DPFE. Open the drain hole and then drill it one size larger. Next, start the vehicle and run it … 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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