Question about 2000 Honda Passport

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Check engine light. Code: Exhaust gas

Check engine light. Code: Exhaust gas recirculation flow insufficient. What should I replace/check?

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Usually this is due to carbon build up. Fuel injector cleaners will not help. It involves removal of the EGR valve and inspection of the valve for carbon and the passages for carbon. You can also test the valve itself prior to removal if it is vaccuum operated. Unplug the vac hose, plug it and then install a piece of vac hose long enough to reach it without bending over the engine. While the engine is idleing apply vaccuum to the hose via a pump or the old fashioned way via sucking on it and note engine idle change. If none either the baffle is bad inside the valve or it is clogged. Hope this helps.
Also, some EGR valves have a vac control solenoid and those go bad too. If the idle does change via the procedure above then suspect the control vac solenoid.

Posted on Jul 15, 2010

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Check engine light code po401


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Check engine light code P0401 98 Ford expedition


OBD-II Trouble Code P0401 - Insufficient EGR Flow

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
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The EGR valve is faulty
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Check it and keep us updated. Hope this helps (remember to rating this free answer).

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P0400 - Exhaust Gas Recirculation Flow Malfunction
The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.

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Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

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P0401= Exhaust Gas Recirculation "A" Flow Insufficient Detected
for more info pls refer to this link http://www.obd-codes.com/p0401
this isn't really nothing major to worry about it just a emission code

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