Problem with engine ligt on

Genuine Nissan Maxima Mass Air Flow Sensor

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ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........

• P0103
  Mass Air Flow Sensor Circuit High Input
• Possible causes
• Faulty mass air flow sensor
  - Intake air leaks
  - Dirty mass air flow sensor
  - Dirty mass air filter
  - Mass air flow sensor harness is open or shorted
  - Mass air flow sensor circuit poor electrical connection
• Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
• possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
  - Engine stall
  - Engine running rough
  - Excessive fuel consumption
  - Excessive smoke
• the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).

2003 NISSAN Altima Sedan OBDII Codes List

The air mass sensor is located on the left hand side of the engine compartment. Follow the large hose which starts out as plastic down and to the front of the car. you will reach a rubber hose about 4" in diameter. It is attached to the back of the air mass sensor.
They stopped using air flow meters in 1979 (I beleive) Then they switched to what they call a "hot wire air mass sensor".

P0100 NISSAN - Mass Air Flow Sensor Circuit Range/Performance Error

Possible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notes Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

. Check the Mass Air Flow Sensor voltages. Verify good battery voltage to the Mass Air Flow Sensor on the White/Black wire. Verify good grounds for the Mass Air Flow Sensor on the two Black wires - look for 0.05 volts or less to be ok. Check the output voltage from the Mass Air Flow Sensor on the White wire - specification is less than 0.5 volts key on engine off and 1.0 - 1.3 volts at warm idle. The Green/Orange wire at the Mass Air Flow Sensor is not used. The Mass Air Flow Sensor can test good and still be defective.

2. Make sure the timing belt is not off a tooth. Can check ignition timing to see if one bank is on. May need to get into compression on each bank but a timing belt off a tooth or two will idle poorly but can run better at higher RPM.

The mass air flow sensor will be in the air intake going to the throttle body. Look for a 3-4" hose, trace that back to a box looking component. The sensor should be in there.

Charlie

maf sensors identify the amount of air flow flowing in the intake. the sensor works with the throttle so it knows how much air is coming in to add the proper amount of fuel to mix with the air. Easy to pull and replace.

MAF stands for mass air flow sensor, this is used to tell the computer how much air is entering the engine, check the air filter,and clean the sensor with CRC mass air flow cleaner, with engine off. hope this helps,let me know Ray

if its the mass air flow you should have a check engine code 171 or and 174 to change that sensor it need to be calibrate with nissan computer better be prepare its not cheap over $600 part labour and calibration good luck pierre

Below I have drawn an arrow to the location of your mass airflow sensor.

If this isn't the same as your engine, just let me know which engine you have and I will have another image for you ASAP.




Also please take a moment and rate my solution to your issue,

Thanks.