Question about 2001 Nissan Sentra

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2001 sentra, MAF continually goes bad, reads p100, replaced three times, is it the computer or something else?

2001 sentra. replaced maf three times will still read p100 and dummy light is on. Is it the computer or something else?

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  • its420_us May 11, 2010

    Did you reset the codes after replacing the sensor?



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Hy mon ami. i own one of those. and your trouble is the MAF. mine is the sentra 2001 2.0 "se sl 1" and i've tried wiht 4 MAF's. the thing is tath u need tath MAF specfically if u tried whit a maf for the 1.8 doesn't gonna work. at least, here in M?xico they just sold this car one year, taht's wy there's not too MAF's for this model. here is about 11000 pesos (like 900 bucks)

Posted on Sep 05, 2009

  • theoldtony Sep 05, 2009

    well mon ami. i have one of those. and the problem is the MAF. it has to be a MAF for the 2001 2.0 specifically mine is the "se sl 1". so, if u put on a 1.8 MAF, it doesn't gonna work. here, in México. they just sold it one year. so is hard to find. and they've given me prices about 11000 pesos taht is like 900 bucks. good luck!


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I think you may have a open circuit to that sensor...Check the wiring harnass for damage...Rap the sensor with your knuckles or move the wiring harness around...See if you can make the engine stumble...

Posted on Feb 12, 2010


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2001 Buick la sabre Code p0171 and p0102 I have replaced every thing but the Maf and erg

did you clear all codes after fitting everything the read for codes again

try cleaning the plug in contacts of the maf
and cleaning the maf itself
Mass Air Flow (MAF) Circuit Low Input

A code P0102 may mean that one or more of the following has
The MAF may be disconnected, or a wiring connection may be bad The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). The MAF sensor may be faulty The vehicle computer may be faulty (very rare)

if you replaced.02 should not throw a pO171code

egr valve ...can be tested ...even cleaned



Oct 20, 2016 | Cars & Trucks

1 Answer

My Jetta runs real good however the EPC lamp stays on and check engine lamp is on. I scaned and got Two codes.

The 102 code is a Mass Airflow sensor circuit code. It saus the voltage output was below expected.
the 322 is a crak sensor/RPM sensor code saying it didnt see it on at least 1 occaision when expected.

The crank sensor code can be accidentally triggered by long cranks, low battery, or stalls and there may be nothing wrong with the crank sensor.

The MAF sensor code can be caused by a defective MAF, a large air leak downstream of the MAF or in the PCV system causing the MAF to miss sensing too much of the air thats going in and therefore reading low voltage compared to RPM and Throttle position.

Any time the MAF is reading wrong, due to an airleak, timing issue, or defective MAF, an EPC lamp will follow. This just means that the accelerator pedal was in a certain position (wherever you pressed it) and the computer expects a certain MAF reading and a certain throttle reading and a certain RPM and LOAD reading all to match together. If any of them is too far off, you get an EPC light warning you the pedal didnt match something else that was expected.

If the crank code doesnt return after clearing, ignore it for now. The MAF code should be checked 1st with leak tests or smoke tests by a competent mechanic. If you SEE any loose, broken, or cracked hoses with a visual test; you can reattatch or repair those and hope for the best and it may be OK. If you dont see an obvious hose leak, you will likely need to replace something that is causing readings of 2 sensors to mismatch. COuld be the PCV/Oil seperator, throttle body, pedal sensor, or MAF. Guessing could get very expensive very quickly, so my recommendation is have a professional check it properly.

Nov 12, 2015 | Cars & Trucks

1 Answer

2001 Chevy impala starting but stalls out quickly

Try unplugging the MAF sensor. It is located on the top of the throttle body. It should have a three wire connector. If the car now starts and runs than I would suspect a bad MAF. typically the MAF and the connector are replaced at the same time.

Sep 09, 2014 | 2001 Chevrolet Impala

1 Answer

08 sienna codes 171 and 174

open the FSM read what it says. 3.0L or 3.3L???? V6, what is it?
its just 2 errors. in fueling.
the PCM never ever knows what part is bad, it ONLY knows
what tests fail.
it's the job of the tech to do the other tests listed
in FSM ( and long schooling) to find the true case.

is this a please guess question.?
or want to know what the book says.?
login to it there, read that , then ask questions.
p0171/4 (P0 means USA spec fed.code)
bank 1 and 2 too lean. must be a V6, (you forgot to say...)
too lean, would be for a V6.
not both sensors bad, but seen it.
dirty maf, running that POS K&N oil soaked junk for an air filter.
if the MAF gets, dirty, it under-reports AIR and goes WAY lean
on both banks. (stop and go driving can filth up and MAF from other cars filth)
So can a massive air leak in the plenum (main air path from MAF to intake valves, any leaks BIG time BAD)
it not be both exhaust headers cracked sucking in air , but see it.
use a scan tool and look at all sensors. see if they make sense.
what is LTFT. long term fuel trim. +40% bad?
ARe the 2 front oxy sensors, showing, closed loop at hot idle
and racing motor at 2500 rpm steady?
if not we fix that first, devil be dang, codes.
i can force lean or rich and watch both 02 sensors.
this is all class room , methods... ask.

this engine can fail over a MAF to MAP sensor.
but i dont know the trip point, but it will throw a DTC if it did.
the issues with MAF is if it reads low, so low , it cant be corrected
by the O2 closed loop system.
my best guess, is maf reads wrong, or air leaks to the plenum.
and lots of tests.

Jan 29, 2014 | 2001 Toyota Sienna

1 Answer

Ive been having issues with my 2001 tacoma pre runner. The check engine light goes on and off. It read a P0171. I replaced spark plugs and MAF sensor. Light has not come back on again but engine still...

That code is P0171= system too lean (bank 1). The computer is reading a lean condition and is trying to richen up the mixture but is unable to fully compensate for the condition. That is why the engine is running so rich and you are losing mileage. You should be looking for an air leak in the intake system after the MAF, a vacuum leak into the intake manifold, or an exhaust leak at the exhaust manifold gasket or some where above the oxygen sensor. The O2 sensor is seeing excess oxygen that is unaccounted for by the MAF.

Feb 04, 2011 | Toyota Tacoma Cars & Trucks

1 Answer

2001 nissan sentra code po171

ok the fuel pressure is very good , and you replace maf sensor too,
i think 2 probable throubles, one , the catalyc converter clogged , to check remove exhaust pipe section before catalyc and run engine, its very loudness, other is tps fault, tps is throttle position sensor, located on acceleration body

Jul 30, 2010 | 1996 Nissan Sentra

2 Answers

Fault Code reads MAF Sonsor even after replacing the part

It is very possible that you have an open circuit in your connector. I do agree that aftermarket parts have different resistance valves than the OEM, but in this case I think you have more of an electrical problem than a parts replacement problem. Check continuity from the MAF connector to the ECM. Make sure you clean out the air cleaner box and install a new OEM air filter. Aftermarket filters don't alway fix properly and can leave an air gap around the filter. This can allow debris to enter the engine and also contaminate your MAF.

Jul 21, 2009 | 2004 Nissan Sentra

4 Answers

I own a 1997 Pontiac Bonneville my check engine light is on when I got the codes read it said that I had an bad O2 sensor and my mass air flow sensor is bad. My car cuts off on my while I am driving could...

yes the mass air flow will cause the oxygen sensor to have bad readings cause it don't tellthe cumputer to mix the right amount of gas it throughs the whole balance off..i would fix these and see from there...hope i helped..

Jul 09, 2009 | 1997 Pontiac Bonneville

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