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2001 rodeo I have p0401 code help

Trying see if its egr or evap

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EGR. Faulty sensor, Tube blocked with carbon, Faulty EGR valve, or Lack of vacuum to operate are most common causes. I'd check vacuum, etc, before replacing EGR right off the bat.

Posted on Feb 18, 2012


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Posted on Jan 02, 2017

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SOURCE: I'm getting an engine check light, the OBD-II is P0401.

I would check the front o2 sensors because usually the EGR flow is detected by:

The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.

Posted on Oct 13, 2008

  • 76682 Answers

SOURCE: P0401. P0133, P1131- emmision test

Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.

Posted on Oct 16, 2008

  • 48 Answers

SOURCE: 2000 Honda Accord EGR Valve Error P0401

-after you change the part you have to reset/clear the code

-this can be done by either:
(1) using the OBD2 code reader that Autozone used OR since option 2 (below) is very quick
(2) disconnecting the battery for about 30 seconds (this will delete all codes/radio presets/etc) but it will also clear the 'check engine' code
-this is what I do AFTER i write down my radio station presets :)

-hopefully the new EGR valve resolves your issue after you CLEAR the code
...but that code just means a an insufficient amount of Exhaust Gas recirculation (pressure difference) used to keep the emissions in check
-if it comes back, then there are a few other fixes to try also

-let me know if you need further assistance
-please remember to rate me `fix-ya`if it works

Posted on Nov 03, 2008

  • 137 Answers

SOURCE: 2001 pt cruiser codes po 605 and po 700

Diagnostic trouble code P0605 indicates internal Transmission Controller fault. Needs to be replaced

Posted on Jan 19, 2009

  • 2004 Answers

SOURCE: p0401 code

P0401 indicates that EGR Flow Insufficient.

But if you have handled it and believe it is okay, I will give you tips on turning the warning off.

  • All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.
  • Remove the EFI fuse (15A) for 30 seconds with the ignition switch OFF to clear any codes. It may take longer than 30 seconds, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out).
  • Trouble codes can also be cleared by disconnecting the vehicle battery. However, other memory functions (clock, radio, etc.), will need to be reset.
  • After the codes are cleared, road test the vehicle (as applicable for the fault) and recheck if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.
Or remove the battery terminal head for 10 minutes.

Posted on May 27, 2009

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Anon, disconnect vacuum lines,wires, etc. and unbolt EGR from intake shown in 4th video link. Check the attached links,instruction and guides, Good luck
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You've probably fixed this by now. I had the same problem and it wouldn't pass the smog check. I thought I'd have to replace the EGR valve but now know that would have not solved the problem.
The solution was to remove the EGR valve, plug the rear hole and use some carb cleaner down the other hole. I'd get two cans. I sprayed a bunch of liquid in the hole but it just filled up. Had my wife come out and rev the engine for a bit. Finally, the liquid got sucked into the port and I sprayed an entire can in while she kept the engine RPM up. Bolted the EGR valve back on, took it to the Smog check place and it passed with flying colors.

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1 Answer

1998 Isuzu Trooper 3.5 4wd Emission p401 insuf flow. BAD Fuel ec

There is a system that monitors how well your egr system is working and it is saying that it is not. The egr valve is just one small part of that system. The plumbing could be plugged or the monitoring sensor, if it has one could be bad. I'll check into this a little further and get back.

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