The ambient air drawn into the engine is 78% nitrogen, 21% oxygen, and a lot of trace elements.
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Your car may fail an emissions test if it has code P0401. If you get a P0401 trouble code, immediately schedule an appointment with your trusted mechanic. It is important that you pay close attention to your vehicle’s warnings. Total repair costs range from $150 to $750, inclusive of labor and parts. The severity of the problem varies depending on the extent of the components affected. P0401 Repair CostsĬode P0401 warns of problems with your EGR system, from a faulty valve to a dirty temperature sensor.
ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information. Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. When troubleshooting and repairing diagnostic trouble codes, you should consult the factory repair information for your application. You’ll need to diagnose the code accurately to find out what’s triggering the P0401 in your vehicle before you can figure out your plan of attack.Īlso, keep in mind that all vehicles are different. Unfortunately, there isn’t a “magic bullet” fix for the issue.
The exact repair would depend on the root of the problem, and there are multiple reasons why code P0401 might be stored. There’s more than one way of fixing any issues with your car, especially if you’re dealing with OBD-II codes.
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If you’re not confident with the technical knowledge you have, seek a certified mechanic’s help instead of fixing the problem yourself.īut if you would like to diagnose the problem yourself, check out the videos below to get an idea of how to troubleshoot a P0401 code: Obviously, there is more than one potential reason that a code P0401 might be set, and diagnosing the root cause can be a little tricky for the untrained eye.
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Trouble codes on cars with pre-OBD-II systems may vary depending on the make and model year. What are the Possible Causes of the P0401 Code?Ĭode P0401 is experienced by all car types that have on-board diagnostics. To learn more about how the EGR system works and how it developed as an emission control technology, check out our in-depth look. This helps lower your engine’s combustion temperature for a reduction in oxides of nitrogen (NOx) emissions. The EGR system is important because it reduces emissions by allowing burnt exhaust gas to flow back into the engine.
Usually on an OBD2 system that sets the P0401, the ECM/PCM must see the failure on two consecutive trips before it will permanently set the code and trigger the Check Engine Light. If by looking at the feedback loop (whatever it may be on the system in question), if the ECM/PCM determines there is insufficient EGR flow, it will set the OBD-II code P0401. What Does the P0401 Code Mean?ĭiagnostic trouble code (DTC) P0401 stands for “Exhaust Gas Recirculation (EGR) Flow Insufficient Detected.” This code means that the computer detects insufficient exhaust gas recirculation (EGR) flow in the system. Code P0401 means that the computer detects insufficient exhaust gas recirculation (EGR) flow in the system.
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