WILL A DIRTY MAF SENSOR MAKE TH CHECK ENGINE LIGHT COME ON AND BLINK?

Which part did you replace? Try checking the following areas.

• A code P0171 may mean that one or more of the following has happened:
• The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled.
• There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor.
• Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve.
• Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector.
• Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor

Try this web page. https://www.obd-codes.com/p0171

Bank 1 Oxygen sensor fault: Possible causes:

The MAF (Mass Air Flow) Sensor is dirty or faulty
Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.

There could be a vacuum leak downstream of the MAF sensor

Possible cracked vacuum or PCV line/connection

Faulty or stuck open PCV valve

Failed or faulty oxygen sensor (bank 1, sensor 1)

Sticking/plugged or failed fuel injector

Low fuel pressure (possible plugged/dirty fuel filter!)

Exhaust leak between engine and first oxygen sensor

Solutions:

Solutions:


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The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" Air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry

There could be a vacuum leak downstream of the MAF sensor

In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling

Inspect all vacuum and PCV hoses, replace if necessary

Check for a dirty fuel filter and proper fuel pressure

I found this On-Line

Causes A code P0171 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor.

Possible Solutions Possible solutions include:

• In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
• Inspect all vacuum and PCV hoses, replace if necessary
• Check for a dirty fuel filter and proper fuel pressure

Lean condition in fuel injected engine's are caused but a faulty MAF sensor, or it's dirty. Try cleaning the MAF sensor with MAF sensor cleaner which you can buy at most auto part stores. Just follow the instructions on the spray can and also add a bottle of fuel injector cleaner to your gas. This should help and the misfiring could be cause by the lean condition of your engine which should stop as soon as the lean condition is addressed.
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A code P0174 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor. I hope this helps you

Could be the MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could also be a vacuum leak downstream of the MAF sensor which is more likely. You should inspect all the vacuum hoses and try cleaning the MAF sensor. Use only electronics cleaner to clean and let it dry before reinstalling.

If none of those work, then it may be caused by a dirty fuel filter or faulty fuel pump or clogged fuel injectors, but these are less likely

Around 98,000 on my 2000 Avalon, my check engine and VSC light went on. If you go to Auto Zone they could tell you the code that triggered the Check Engine light. When a sensor detects a malfunction, the engine computer turns on the Check Engine light which also disables the VCS In my case the problem was a dirty MAF mass air flow sensor which sits in the air tube between the air filter and trottle body. Two tiny screws and a disconnect to the wire and out comes the MAF. Sprints a shot of MAF cleaner, discconect your battery, reinstall MAF start her up and all was well.The key to the problem solution is finding out why the check engine light came on. If it did not come on, I would still check it for fault codes.

it sound more like you have a vacuum leak then a bad fuel pump that's why you keep getting lean codes have some one rev the engine slightly while you listen under the hood for the whistling noise the whistle is the vacuum leak

Most likely you need motor mounts for the shaking and clunking.
The check engine light being on could cause the accelerating problem. It could be something as simple as the fuel filter being old and plugged up. Have you ever changed the fuel filter? This could cause the engine to run lean making the check engine light come on. And when accelerating the engine will be "starving" for fuel causing poor acceleration.