Question about 2003 Chevrolet Suburban 1500

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Trying to locate MAF sensor on 2003 suburban 1500 to check/clean as solution to engine performance and PO171/174 code displayed on personal diagnostic scanner.

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  • villarrealjr Jan 30, 2009

    i have the same problem how i fix it

  • Anonymous Mar 29, 2014

    Cannot locate the position of my MAF sensor. I have coils not distributor cap on my chevy s10 1998

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Look near your A/C system and under the overflow hose for the coolant. It is a round can looking thing with a small wiring harness attached on top. There rae 3 hex screws holding it on to the bracket. Remove these and slip it off of the air intake tube. Use a small screwdriver to depress the small latch on the inside of the harness and gently pull it off. Disassemble the MAF sensor from the mounting plate, remove it from the vehicle and spray the wires with carburetor cleaner several times. That should clean it up for you. Good luck and let me know if you need more info.

Posted on Feb 16, 2009

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Black can shape right after air cleaner housing outlet.

Posted on Jan 18, 2009

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1 Answer

Show me location of code po102


This is the Mass Air Flow Sensor. It's a screen-like device located on the air intake line to the throttle body. It measures the flow rate and density of air entering the engine. The code can mean a few possible things:

1. Dirty Air filter
2. Dirty MAF Sensor
3. MAF Sensor wiring problems

Try replacing the air filter first. Remember that engine codes must be reset or they will remain in the computer even after repairs. If that doesn't work you can remove the MAF and clean it with a MAF Sensor approved spray cleaner. If you use the wrong cleaner you will destroy the MAF. If cleaning the MAF don't work, then replacement is indicated.

Nov 07, 2013 | 2003 GMC Yukon Denali

1 Answer

Trying to replace the knox sensor but i cant locate it in the engine


the knock sensor is located under the intake manifold in the cavity between the two engine banks. be sure to apply a layer of silicone or some sealant around the sensor after installing, this will keep water from gathering around it causing it to fail again.

Apr 05, 2011 | 2003 Chevrolet Suburban 1500

1 Answer

OK My 03 2500, Silverado pulls a code: PO 101, Mass Air flow circuit out of range, what do I change to fix it?


The MAF sensor (Mass Air Flow) is located in in the air induction system usually just after the air filter and before the throttle body, and the ECM (Engine Control Module) uses the signal generated from the MAF sensor to determine how much fuel the engine receives. However, before you replace the MAF sensor you should be certain that there are no air or vacuum leaks in the air induction system especially between the throttle body and the MAF sensor, and also that all of the hose clamps are all good and tight on the air induction boot especially between the throttle body and the MAF sensor, and check if the air flow is being restricted from the air cleaner side of the MAF. (check the air filter and check the air intake to the air cleaner for any obstructions that might be restricting the air flow to the MAF)

You can also clean the MAF sensor with carburetor spray because they build up a very fine dust on the air velocity sensors that are mounted on wires that are suspended in the air stream to monitor and determine the amount of air flow into the engine, and when the MAF sensor becomes dirty the MAF sensor will loose performance. Be very careful when cleaning the air velocity sensors inside of the MAF sensor because they are very delicte and are easily damaged, and do not touch them with anything other than the spray from the carburetor can and that is all that is necessary to clean the air velocity sensors. Here are some images that I have put together to assist you.


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Jun 21, 2010 | 2003 Chevrolet Silverado 2500HD

1 Answer

Suburban runs lean with K&N air filter


Check for vacuum leaks, especially around the intake manifold gasket. You can do this by running the engine and spraying intake cleaner around the gasket. Any vacuum leak will **** in the intake cleaner and cause the idle to change.

It could also be a dirty Mass Air Flow sensor, faulty oxygen sensor on bank 2, plugged catalytic converter, or plugged or faulty fuel injectors - thus, it would never hurt trying the sea foam.

Also ensure the filter is not over-oiled

Mar 30, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

98 chevy suburban, code reads mass air flow sensor low input. whats the problem? i have replaced the mass air flow sensor twice and i have no vacum leaks.


Check the wire leads and clean them before reconnecting the wire leads. It wouldn't hurt also to clean the MAF sensor with MAF cleaner, the code your getting is most common to the high performance oil base filters like K&N.

Good luck and this should help you resolve your MAF issues. Thank you for using Fixya

Mar 12, 2010 | 1998 Chevrolet Suburban

1 Answer

Code po101, hard start when hot (have to hold W.O.T. to start) & stumbles on accelertion. Changed MASS sensor, no help.


Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.  I would try cleaning out your MAF sensor with some carb cleaner and reseting the check engine light to see if it comes back on.  If it does, get back on here and let us know and we will walk you through some other things you can try.  Cleaning it out will be the easiest/cheapest thing for you to try right now.  Good luck.  Thanks for an honest rating and for using FixYa.   

May 22, 2009 | 2003 Chevrolet Suburban 1500

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