Rick's Free Auto Repair Advice

Posts Tagged: EGR

What is an EGR valve?

What does an EGR valve do and can I delete my EGR? I often see car owners ask how to perform an EGR delete. Doing an EGR delete is a really bad idea. But in order to understand why, I first have to cover, “What is an EGR valve.” What does an EGR valve do? When the EPA first addressed air pollution, they directed their attention to the amount of unburned hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2), and oxides of nitrogen (NOx). By adjusting and monitoring air/fuel mixtures, … 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

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

P0404

Fix code P0404 Exhaust Gas Recirculation (EGR) Circuit Range Performance If you have a P0404 EExhaust Gas Recirculation (EGR) Circuit Range Performance trouble code, read this to understand what it means Engines recirculate a small amount of exhaust back into the intake manifold to reduce combustion temperatures and lower smog causing oxides of nitrogen emissions. The computer commands the EGR valve to open a certain amount and then checks to make sure it’s operating properly. One way to check is to mount a position sensor on the shaft of the … Read More

P0401

Fix code 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 … Read More

P0400

Fix code P0400 Exhaust Gas Recirculation Flow Malfunction If you have a P0400 Exhaust Gas Recirculation Flow Malfunction 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 … Read More


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