I had an intake leak one of the clamps on the snorkle was loose between the air filter and the throttle body.the service engine light is still on after I fixed the intake leak.I bought a code reader and it will not show a reading.I tried it on my wifes rav 4 and got a reading.I called the tech line for the code reader they had me run some tests still no reading.I have the right year and model for the code reader .It has a reset feature.The van runs great.Can I diconnect the battery to reset the trouble code?
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Check for vacuum leaks...
If you have a crack or leak in your air intake downstream of the sensor, then the MAF will be sensing less air than the engine is actually receiving.
If the clamp on the throttle body happens to come loose and fall off, then the MAF will indicate almost no air being sucked through the intake, yet the engine will be sucking air directly from the engine compartment into the throttle body.
Also depending upon the year of the vehicle, you need to make sure you replaced the MAF sensor with the right type designed for your car.
1999 and earlier: use one type for throttle cable
2000 and later: e-gas electronic throttle
Drive the car a bit and see if the ECM resets the code faults. BTW, did you check the air filter?- sometimes if this is not working properly, the filter could allow debris or dust to collect on the MAF sensor...just a last minute thought
I assume that someone looked at the "Check Engine" codes and saw this sensor error. If that is true, you will find the sensor inside that air intake that connects the air filter housing to the engine throttle housing. If the code is not why you are replacing it, first be completely sure you don't have any vacuum leaks. The intake tube will be a large rubber tube that has maybe a couple electrical connections and maybe a smaller hose. At any rate there is at least one connection to the air flow sensor. Disconnect the electrical connections and take that hose loose from the air filter housing. Take the filter housing off. Then you should be able to take the air intake tube off the throttle housing. It will have a fairly normal hose clamp. When you put this back together, be sure all the connections are tight and that there is nothing that might be an air leak. A leak in the intake allows air into the engine that has not gone through the sensor causes some serious performance problem by the fuel/air mixture being too lean. Should you see a suspicious connection of a vacuum hose anywhere, fix that first. You don't say what the problem is but a vacuum leak could look like an air sensor problem, unless the engine code specifically points to the sensor. Now that you have the intake tube off the engine you can look in and see the sensor in the tube. It is usually mounted by some small screws to the intake tube. It should be easy for you to take out of the intake tube. While you have the intake tube off, it's a good idea to clean the throttle plate and throat. Buy some spray cleaner that says it if good for throttle and does not harm oxygen sensors. Follow the can directions. Clean the throttle plate, then open the throttle full and spray all the inside if the throat that you can see. Put it all back together. The engine my be a little hard to start because of the cleaner you sprayed into the throttle throat. If there was an engine code you need to clear that so the light goes out and the old code doesn't remain in the system. To clear the code, disconnect the battery for about 5 minutes. Good luck. I hope this is helpful. Thanks for using FixYa. Gaker
P0102 OBD-II Trouble Code - Mass Air Flow (MAF) Circuit Low Input
What does that mean? Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.
Symptoms You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes A code P0102 may mean that one or more of the following has happened: * 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)
Possible Solutions The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.
P1131----- H2Os-11 running lean.
Here are some possible causes:
Dirty or malfunctioning mass air flow sensor ( mounted in the air intake hose that goes from the air filter to the throttle plate).
Vacuum hose leaking
Intake manifold gasket leaking air
Low fuel pressure
Dirty fuel injectors
This is where testing has to be done to pin point the cause without having to replace things you don't need to.
Check for vacuum hoses off at the rear of the upper intake manifold. Also check the large black tube from the air filter housing to the throttle body.Make sure it's on and the clamps are tight, and any hoses to it are connected. Is the check engine light on? If so,you might think about taking it to your local repair shop (someone you trust) and scan the vehicle computer for trouble codes.
The codes are lean fuel condition for both banks. A very common problem with this engine that will set these codes are the upper & lower intake gaskets. You may experience a rough or rolling idle at cold start up and the condition will go away as the engine warms up. If you have checked all the basics such as vacuum leaks or air inlet leaks between the air filter box and the throttle body, then I would consider replacing these intake gaskets. Good Luck and please leave rating. Thanks