May 24, 2021 · Pre-OBD2 Asian vehicles are often fitted with a two wire EGR temperature sensor that will report hot exhaust gas when the valve is open – or the lack of hot exhaust gas if there is no flow. These feedback methods are all about closing the loop. OBD 2 systems are required to monitor EGR flow and store a P0401 code if exhaust flow is insufficient.. "/>

The different EGR rates of 0%, 10%, 20%, 25% and 30% were considered to study the impact of EGR on performance and emission characteristics for an en gine f ueled with waste cooking oil Biodiesel. My 2003 Jetta TDI check engine light recently came on, and a scan by Advance Auto revealed code P0401 -- EGR insufficient flow. I took the vehicle to the local TDI guru, who gave me the option of removing the EGR from the system entirely, and replacing it with a race pipe (and a rechip to prevent the CEL from coming on). The FAQ at Dieselgeek. Causes. Possible causes of OBD code P0400 Audi. A code P0400 Audi may mean that one or more of the following has happened: Plugged EGR passage which restricts the flow of exhaust gasses Faulty EGR solenoid Faulty EGR solenoid wiring/harness Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve Faulty EGR valve. Jan 06, 2013 · Assuming its a BKD 2.0 tdi, check the other part of the egr system, the egr cooler/valve at rear top left of engine, its got a spring valve as such, so its maybe stuck, you can work it back/forth by hand & you may need to move the maf piping aside to get behind there if you have big hands/arms..

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