Question about 1998 Mazda Protege

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I got the code p0400 1. blocked passage on EGR sustem 2. failed EGR valve

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First take the egr valve off then get some carb cleaner spray it into the egr valve ports let sit 30-60min then take a small flat head clean any carbon left over in it. then check the vaccume lines to it they to might be plugged you can take a small wire or push pin and stick it in the ports to unplug it.

Posted on Sep 06, 2008


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Egr code wont clear it says not complete put a new one on still same problem

If the passages the valve is bolted to are still clogged up with carbon deposits, the egr valve won't work right. Did you verify the passages into the engine block are clear?

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1998 Buick Century Custom 3.1--service engine soon light is on, I check the computer and it says EGR insufficiant flow code P90401. I changed the egr valve lite still on. Went back to Autozone checked...

well I'm a mechanic and you just told me what's wrong....
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I have a ford explorer sport 2002 and my chek engine light came on it put out a code PO401 do you know what i need to buy

PO401 code means that:
The PCM has determined that there is insufficient flow in the exhaust gas recirculation system. Definition: EGR system fault (Exhaust Gas Recirculation) Probable Causes: a. Blocked passage on EGR system b. Failed EGR Valve c. EGR solenoid faulty d. Failed EGR pressure sensor where applicable e. Failed EGR position sensor where applicable

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Code p0400 keeps coming up after changing the egr valve and sol.

It may be that the passage to the exhaust is blocked also.

Aug 14, 2009 | 1996 Nissan Sentra

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1990 Dodge Dakota Smog Issue


PPM of Nox or Co or HC?????

The base of the EGR and the EGR air passage tube will collect carbon over the years.

Most car over 65,000 will fail Nox and has high CO because of the partly block passage.

The only way to clean to the air passage tube is with a lot of WD-40 or similar cleaner.

The EGR valve can be clean or replace under $68 ////gasket for around $3.

Make sure there is NO LEAK when you put the EGR valve back in place.

Please post what PPM is failing on reply.

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Got code for egr but i heard it might be dpfe sensor can anyone let me know where its at and looks like on 94 crown vic police intercepter thanks

It is highly unlikely that the sensor is bad. What the most common cause of DPFE codes is a blocked EGR passage in the intake manifold. The car is 15 years old and over that time has accumulated carbon build-up in the passage. The passage is located in the intake manifold beneath the air-intake casting.

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Failed e-check check engine code egr solenoid valve

go here and read files, especially all about EGR.

could be plugged passages, a bad BPT, bad EGR valve, bad EGR solenoid. We'll help you diagnose.

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How do you clean the EGR valve on a 99' Honda Civic?

Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.

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1 Answer

Auto Diagnostic Trouble Code

cORRECT. tHIS CODE DOES DEALs With emmissions. P1400 deals with the EGR valve. In case u are not aware, EGR stands for Exhaust Gas Re-circulation. What really this valve does is that it re-cycles some of the exhaust gases into the cylinder for combustion. The EGR valve might be blocked or has malfunctioned. It is advised that this valve changed or consult with a mechanic who is knowledgeable about this technology. a malfunctioned/dis-abled EGR system will cause the car to fail an emissions test, and may cause the EGR passages in the cylinder head and intake manifold to become blocked with carbon deposits, necessitating extensive engine disassembly for cleaning. So it is advised that u repair this ASAP

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