![]() The repair also involves cleaning the EGR passages. In the 90's and early 00's Mazda cars and trucks, the code P0400 could be caused by clogged EGR passages, often in the throttle body. A service bulletin for the 1998-2002 Frontier and Xterra with a 2.4L 4-cylinder engine recommends cleaning the EGR port in the intake manifold the EGR port plugs need to be removed The repair involves removing and cleaning the EGR temperature sensor an the EGR tubes, ports and passages. Pathfinder, Altima, Maxima, Frontier, Quest) the code P0400 could be caused by a carbon buildup blocking the air flow around the EGR temperature sensor. On many 90's and early 00's Nissan vehicles (e.g. Your local dealer will be able to confirm if the EGR valve part number has been updated. For some models, the EGR valve has been updated. Many owners reported the problem fixed after cleaning the EGR passages and replacing the EGR valve. In Nissan vehicles the EGR temperature sensor clogs up often it needs to be inspected first. If a clogged catalytic converter is suspected, the exhaust back pressure needs to be checked. In a Subaru, the BPT valve needs to be checked along with other EGR components. In some older Mazda vehicles, the EGR boost sensor and its vacuum hose need to be checked as the sensor could fail or the sensor tube could be restricted or cracked. Check the electrical part: the connectors and the wiring to the EGR valves, solenoids and sensors. Check the vacuum line routing according to the vacuum line diagram. Usually, if a carbon buildup is found in one part of the EGR system, the other ports and passages could be clogged too, so the entire EGR system needs to be checked for restrictions and cleaned if needed to fix the problem. The most often found problem with the EGR system is carbon buildup restricting the EGR flow. electrical problem with the EGR valve control circuit open or short in the EGR temperature sensor circuit carbon deposits (soot) on the EGR temperature sensor (Nissan) cracked or restricted vacuum line to the manifold absolute pressure (MAP) sensor clogged or leaking vacuum line for the EGR valve However, if the EGR system doesn't function properly, the combustion temperature will be higher, which in the long run could cause engine damage. If the code P0400 is caused by some minor issue like a faulty EGR temperature sensor and the EGR system works properly, there should be no problem driving. In some vehicles, if the EGR system doesn't work, there might be some engine pinging (detonation) noticeable on acceleration or under load (e.g. If the EGR valve is stuck open, the vehicle will have rough fluctuating idle or stalling. There might be some driveability concerns, such as, surging, poor fuel economy, rough idle, but in some cases there could no noticeable symptoms at all. In most cases, this happens when carbon deposits (soot) clog up the EGR system passages and tubes. The code P0400 is set when the EGR system flow is less than expected. It directs a portion of exhaust gases back into the engine intake to lower the combustion temperature, read more how the EGR system work. The Exhaust Gas Recirculation (EGR) system is a part of the vehicle emission control. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.
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