Rick's Free Auto Repair Advice

Posts Tagged: Exhaust Gas Recirculation

P0406

P0406 Exhaust Gas Recirculation (EGR) A Circuit High If you have a P0406 Exhaust Gas Recirculation (EGR) A Circuit High 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 EGR valve … Read More

P0405

P0405 Exhaust Gas Recirculation (EGR) A Circuit Low If you have a P0405 Exhaust Gas Recirculation (EGR) A Circuit Low 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 EGR valve … Read More

P0404

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 EGR valve … Read More

P0400

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 done when … Read More


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