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Old 10-10-2017, 03:54 PM
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Default 2009 sentra 0171 code

Hello and excuse my ignorance.
2009 Sentra with 87,000 miles.
I have received this 0171 code for awhile. I tried the simple things first like gas cap, clean the MAF sensor, fuel injector cleaner and air filter. Before I start spending non refundable money on electronics my son reminded me that a few months before this code popped up my oil fill cap came off. I have never added oil to this engine between oil changes. I don't change my oil. How this happened ????? Needless to say after driving on the turnpike oil was everywhere under the hood. I washed the engine down at the carwash. Could oil/engine cleaner have gotten into some of the sensor connectors that over time is creating a connection issue. I tried to find online a cable harness schematic that might show me the location of electrical connectors around the engine compartment but was unsuccessful. Am I wasting my time on this idea or should I start purchasing sensors and change them out.
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Old 10-11-2017, 03:41 PM
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Usually when water gets into a connector and creates an issue, it does it by shorting the circuits inside the connector or by corroding them and creating a high resistance or even an open circuit, all of which usually trigger a trouble code. So, unless you have stored trouble codes other than the P0171 code, I'd be doubtful. Of course, the only way to be sure would be to go through all of the engine compartment harness connectors, open them up and dry them out with electrical contact cleaner and compressed air.
If there are no vacuum leaks under the hood (split or loose fitting intake ducts, disconnected vacuum hoses, leaking intake manifold)...and the fuel pressure is within specs, which you will only know by checking it with a fuel pressure gauge...the most often culprit that'll cause a lean system code is a faulty mass air flow sensor (or, "MAS"). They usually fail and set MAS trouble codes, but not always and even trying to check them using a scan tool by viewing data logging can be tricky to confirm a faulty MAS. P0171 codes caused by bad oxygen sensors or air/fuel ratio sensors are often accompanied by a code for one of those sensors, as well. If it were me and I didn't have a scan tool nor wanted to go to a shop and have it properly diagnosed, I would start by confirming the fuel pressure is within specs and would then replace the MAS. That said, trying to fix a problem by going the "guess route" and just keep on replacing parts until the problem is solved can get expensive if one doesn't correct the problem with the first one or two parts...and sometimes a part isn't always the problem (circuit issues are always a possibility, like opens, shorts, high-resistance and poor grounds). The proper way to go about this would be to download the Engine Control chapter of this vehicles factory service manual (which might be available in the "knowledge base" section at this website) and follow the step-by-step diagnostics for DTC P0171.
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Old 10-11-2017, 04:58 PM
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Thank you for the very detailed reply. I have a code reader and it is always the 0171 code no others. The engine runs good although every once in a while when starting it idles rough for a second or two until i rev the engine once or twice the the idle is fine. I think I will try the fuel pressure first then the MAS sensor if pressure os good.
Thanks again for the reply
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Old 10-16-2017, 04:19 PM
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If you replace the MAS, stick with Hitachi or genuine Nissan for best results.
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Old Yesterday, 03:48 AM
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Inspect the intake hose from the air cleaner housing to the throttle body. Make sure there are no holes or cracks in the rubber.

Quote:
Originally Posted by Bachida View Post
Thank you for the very detailed reply. I have a code reader and it is always the 0171 code no others. The engine runs good although every once in a while when starting it idles rough for a second or two until i rev the engine once or twice the the idle is fine. I think I will try the fuel pressure first then the MAS sensor if pressure os good.
Thanks again for the reply
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