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Diag codes P0136,P0400,P0440 Forums > > Diag codes P0136,P0400,P0440 Diag codes P0136,P0400,P0440
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  #1  
Old 11-07-2006, 10:36 AM
Hawkeye75
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Default Diag codes P0136,P0400,P0440

Hello Everyone, new to the forum, have found a lot of useful info here so far.

Recently I purchased a 1996 Maxima. MIL light came on 3 days later.
Had the computer read and codes P0136,P0400,P0440 were stored in memory.

Was told that code 440 was usually caused by a loose or faulty fuel cap, the cap was on tight so I replaced the fule cap.

Drove the car for 160 miles MIL still on.

Took the car back to the part store, had the codes checked all 3 still present.

Was told that code 400 was caused by bad flow through the EGR.
Next removed and cleaned the EGR valve, which had a lot of carbon deposits.
Re-installed the valve started the engine and MIL was still on.
Disconnected battery overnight, about 10 hours, reconnected battery and started the engine MIL still present. So far I have driven the car about 150 miles. If a dirty EGR was the issue will the codes clear themselves, if so, how long does this take. I want be certain it was the EGR causiing the MIL before I spend a lot of money on an oxygen sensor, which I am told is the rear OS sensor.

The car runs great, but I need to clear this MIL as I will be giving it to my son to use for school.

I find it rather strange that all 3 codes would be generated at the same time. Any input on further troubleshooting would be appreciated.

Thanks
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  #2  
Old 11-07-2006, 07:44 PM
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There all different and common problems.

P0136 - O2 sensor. Most like likely you need to replaced the sensor. Here is a bulletin to help you locate the sensor. (use the 1999)

1999-2001 NISSAN MAXIMA; O2 SENSOR IDENTIFICATION

P0440- evap small leak. Is very common that the canister come apart or the fuel cap is not sealing properly. Here is a bulletin to help you inspect the canister.

Service Bulletins Nissan Cars

P0400 - EGR system. What you did it should take care of the problem.
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  #3  
Old 11-08-2006, 05:05 AM
Hawkeye75
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Thank you very much for your reply, most helpful.
I will post again with results after I take care of the sensor and canister repairs.
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  #4  
Old 11-08-2006, 05:48 AM
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It is very common fot the egr tube to be plugged also. It can be removed and cleaned with carb clean and a wire coat hanger.
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Old 11-08-2006, 07:06 AM
Hawkeye75
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Thanks MPE, I will double check that the egr tube is clear. Also is it possible that one point of malfunction, say the EGR system, or Evap Canister could cause a false reading to be sent from the rear O2 sensor ?
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  #6  
Old 03-28-2009, 01:27 PM
mccdog
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Hey Hawkeye75 wondering if that repair fixed your problem i am having the same issue.
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  #7  
Old 03-12-2012, 01:14 PM
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Very helpfull tread thanx guys
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  #8  
Old 10-23-2016, 09:37 AM
pop pop is offline
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does anyone really know how to fix a po440 code...i replaced gas cap....no lucky..cleaned the charcoal canister and blew the rubber lines with a compressor......no luck... still have 440 code,,,,,,,any ideas how to..............
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  #9  
Old 10-23-2016, 01:11 PM
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I don't know how you can "clean" a charcoal canister; attempting to do so could damage the foam liner and cause bits of charcoal to get pulled into the evap system, with can be a real mess! In my experience, while most people will replace the gas cap to fix this code, it very rarely works. P0440 is a small leak code, so any leak in the evap system can cause the code. Many times, it's the vent control valve attached to the canister that sticks open and causes the code. There have been some rusting issues with 1st generation Frontiers on the gas tanks that can cause this issue. The best way is to use a smoke machine with an adapter for the evap system test port and a scan tool that can close the vent control valve and monitor the evap pressure sensor voltage. Nissan did release a service bulletin, NTB09-020a, which you can download from the "knowledge base":

http://x.nissanhelp.com/forums/local...p=10&keyid=739
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  #10  
Old 10-24-2016, 05:42 AM
pop pop is offline
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can the vent control valve be removed and cleaned................?
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