Question about 1999 Buick Century

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I left electric connector off during servicing and started the card. Now check engen soon light is on. How to turn it off.

I cleaned mass air sensor & filter but neglected on connection when I started car. Now it shows Check Engine Soon. How do I shut that off?

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Disconnect the battery for 5 minutes, that will reset the check engine light and clear the code you set..

Posted on Apr 17, 2009

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2003 Nissan Altima 2.5L Service Engine Soon Light is on, Auto Zone says codes are for MAF and O2 Sensors. Car hard to start after driving a while but when starts appears to run smooth. Auto Zone thi


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

Oct 22, 2014 | 2003 Nissan Altima

1 Answer

I have a 2000 excursion and sometimes wen I accelerate it starts chocking out at 2000 rpm and won't go any higher


Mostly your MAF MASS AIR FLOW SENSOR needs cleaning.
1st Disconnect the battery ground cable
then open the engine air cleaner.
  • Disconnect the MAF sensor electrical connector.
  • Release the air cleaner clamp.
  • Separate the inlet side from the outlet side of the air cleaner.
  • Remove the MAF assembly.
  • Disconnect the MAF sensor electrical connector.
  • Remove the nuts and separate the MAF sensor from the MAF sensor plate.
As shown

5_2_2012_12_14_19_pm.jpg
then follow the steps in the video.
HOW TO CLEAN A MASS AIR FLOW SENSOR

if that did not clear your engine chocking then make sure there is no Vacume leak.
hope that helps

May 01, 2012 | 2000 Ford Excursion

1 Answer

P0121 and p0068 on a 2003 dodge ram 1500 replace the throttle position sensor and the idle air sensor at the same time then ran for a week with no problems then the truck started idling up at random then...


P0121 The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.
Potential Symptoms Symptoms of a P0121 trouble code could include:
  • Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
  • Intermittent stumble on acceleration or deceleration
  • Blows black smoke on acceleration
  • No start
Causes A code P0121 may mean that one or more of the following has happened:
  • TPS has intermittent open or short internally
  • Harness is rubbing and causing an open or short in the wiring
  • Bad connection at the TPS
  • Bad PCM (less likely)
  • Water or corrosion in connector or sensor
Possible Solutions 1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.

2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilloscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilloscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.

3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.

4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.

5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.

6. Look for any water in the connector and replace TPS as necessary.
P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

Jun 05, 2011 | Dodge Ram 1500 Cars & Trucks

1 Answer

I own a 2003 Nissan Altima SE 3.5L. Recently, my car sounds like it is stuck in 2nd gear. The RPM's do not run high but the car sounds like it is racing in second gear. This is an automatic. Help?!


If your service engine soon light is on, go to autozone and have the code pulled up. Sounds like you are in limp mode (safe mode). I suspect it is your mass airflow sensor. Its easy to replace but expensive. I recommend getting one from a junk yard and installing it yourself. if you dont have any mechanical experience dont worry. As soon as you see one it will be obvious you dont need experience. It is in the middle of the big tube that connects your air filter to the throttle body. All you need is a screw driver and disconnect one electrical connector. Again, not worth buying new...they cost over $350 new but only $60 at junk yard.

If you want a quicker way to check, dissconnect the big tube from the intake manifold, in essance letting air run directly to the throttle body without going thru the air filter or mass airflow sensor. If the car runs fine with it dissconnected, its the mass airflow sensor. Buy some mass airflow sensor cleaner at an auto store (its specifically made and named mass airflow sensor cleaner). Try to clean it first...Dont touch anything inside with your finger tho.

Sorry if Im sounding like a school teacher but Im not sure of your mechanical knowledge or ability.

If not none of this works , you will have to pull up the code.

May 19, 2011 | 2003 Nissan Altima

1 Answer

I have a service engine soon light, the o2 sensor has already been replaced and it still threw a code for the air flow sensor.


The air flow sensor is different than an O2 sensor. The Mass Air flow sensor is located in the hose that comes from the air filter box. You can try taking it out and cleaning it with a spray cleaner that is fast drying meant for electrical components. It may just be dirty. DO NOT USE COMPRESSED AIR TO DRY THE SENSOR!!! It has very small, very fragile resistors inside that can break and ruin the sensor. If the light comes back on after cleaning the sensor, it will have to be replaced. Check the wires going to the sensor as well to make sure they are not damaged.
Hope this helps. Good luck!

Apr 09, 2011 | Nissan Sentra Cars & Trucks

2 Answers

Mass Air Flow Sensor replacement?


Removal & Installation V-6 MAF Location gmpc_34maf.gif

To Remove:
  1. Remove or disconnect the following:
    • Intake air temperature (IAT) sensor electrical connector.
    • Mass air flow (MAF) sensor electrical connector.
    • Air inlet duct from the MAF sensor and throttle body.
    • MAF sensor from the air cleaner housing.
To Install:
  1. Install or connect the following:
    • MAF sensor to the air cleaner housing.
    • Air inlet duct to the MAF sensor and throttle body.
  2. Tighten the air cleaner duct clamps to 18 in lbs (2 Nm).
  3. Install or connect the following:
    • IAT sensor electrical connector.
    • MAF sensor electrical connector.
  4. Start the engine.
  5. Check the air intake duct for leaks.
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Jul 07, 2010 | 2000 Oldsmobile Alero

1 Answer

My 2000 ford expedition will not pass smog test due to P0102 code causing the service engen soon light to stay on I think it might be the mass air flow circut dose that sound right if so isis that circut...


The mass air flow sensor is in the air intake between the filter and throttle body. The filter is in one half of the air box and the sensor is in the other. You should have a wire harness running out the bottom and a connector toward the top. When you split the chamber to access the air filter, tip up the half to your left and you will see it. Sometimes you can get by with cleaning it, but you may not have a permanent fix. You must ONLY use a cleaner that does not leave ANY residue, such as brake cleaner. Make sure the connector is fully engaged, and check for bent or pushed back pins. Sometimes the pin locks in the hardshell were never fully engaged and the pin connectors push out the back of the plastic hardshell connector. Hope you save some cash on this one. I realize how costly repairs are these days. Well wishes.

Sep 12, 2009 | 2000 Ford Expedition

3 Answers

I have a 1995 ford taurus engine stalls when idling and smells of gas when accelerating it bucks. Changed fuel filter, could it be mass air flow sensor?


Start with smaller problems and check the fuel pressure regulator, the mass air flow sensor for these vehicles is pretty pricy. Is the check engine light on? If so, head to your nearest auto zone and have them check for trouble codes. If the check engine light isn't on, its not likely your mass air flow sensor

Jul 09, 2009 | 1995 Ford Taurus

2 Answers

Service vehicle soon light


Do all your exterior lights work. Including the daytime running lights. This is the service vehicle soon light and not the service engine soon light? Does the service engine light come on when you turn the key on? The service vehicle light will also stay on if the service engine light is burnt out.

Mar 30, 2009 | 2002 Chevrolet Monte Carlo

1 Answer

2001 cheve venture (service engine soon) trouble light on


If ou fixed whatever happened during the oil change, the light will cycle off after about 3 drive cycles.

The check enine light just tells you that you are not meeting emissions right now. Only be concerned if it's flashing. That means you are sending unburned fuel to your catalytic converter whih will overheat and self destruct.

Look for a vacuum hose disconnected and check all the onnections to sensors such as, vehcile speed control sensor, mass air flow sensor, crankshaft position sensor, camshaft poition sensor, throttle position sensor, etc. Good luck.

Feb 27, 2009 | 2001 Chevrolet Venture

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