When you first start the motor it runs fine except it will miss for maybe one second every 30 seconds or so. After maybe ten times misfiring, the check engine light will flash and the warning bell will ding for about 5 seconds, then everything goes out and the engine will run perfectly until you shut it off , even if you drive it miles which I have done several times..
When you restart it it goes through the same pattern again… every time. I have a new computer ordered in hopes that will stop it. I have the Astra J.. Because it will start bringing out some dirty to block the nozzle. I have a Lincoln Navigator that is in mint condition. Last night she gave me a code P I cleaned the Mass Air Sensor, but the code returned.
The plugs and fuel filter have fewer than miles on them. The injectors have been cleaned and there are no vacuum leaks. She is running smooth as glass and even getting better milage since I cleaned the mass air sensor. Any other ideas?
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Share Share. Code P Definition Bank 1 has too much air or not enough fuel. What Does P Mean? Dirty or faulty mass airflow sensor Vacuum leaks — PCV hoses, vacuum hoses, intake manifold gasket. If other codes are present, they must be addressed first. Inspect all vacuum lines and hoses for leaks, and make sure they are properly connected.
If a leak is present, you will hear a hissing sound, though it may be difficult to hear with the engine running. If you suspect a vacuum leak but are having trouble finding it, check out this detailed guide to finding vacuum leaks.
Reconnect any disconnected vacuum lines and replace any damaged vacuum lines that are leaking, then use FIXD to clear check engine light code P If check engine light code P is triggered again, check the rest of the vacuum lines for leaks and continue to the rest of the diagnostic process.
Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass airflow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P continue the diagnostic process. If you confirm there are no vacuum leaks, have a clean mass airflow sensor, and your fuel system is functioning properly, check the exhaust for leaks before the Air Fuel Ratio Sensors or Oxygen sensors if you find any leaks have them repaired.
Estimated Cost of Repair For error code P, one or more of the below repairs may be needed to solve the underlying issue. FIXD Team.
Previous Post. Next article. You may also like. Change mass air flow sensor For sure. Intake manifold gasket!! Hi David, You might need to take it to a mechanic and check to see what the problem could be.
Clear the code and trade it immediately. Intake manifold gaskets. Did you fixed? What was the problem i have the same problem? Pleadr answer me. Just junk the car. Have you tried replacing the fuel filter? Hi Kevin, There are multiple causes to trouble code P No problem Kenneth!
Glad we could help! Common mistakes when diagnosing the P code A common mistake that could be made when diagnosing the P code would be not looking for any technical service bulletins for your specific car model that may be related to this issue. How serious is the P code? What repairs can fix the P code? Replacing the fuel pump Replacing the fuel filter Replacing the fuel pressure regulator Replacing the powertrain control module Replacing one or more injectors Replacing one or more oxygen sensors Replacing the mass air flow sensor Repairing a vacuum leak Additional comments regarding the P code It is unwise to drive a vehicle with this trouble code stored for a long period of time.
Need help with a P code? Looking for an OBD2 code reader to diagnose your check engine light? Check out dozens of great OBD2 scanners here Buy Now Autoblog may receive a share from purchases made via links on this page. Pricing and availability is subject to change. Ownership trouble codes check engine light.
View More. Thank You Thanks for subscribing. Check your in-box to get started. Sign Up More Info. We notice you're using an ad blocker. Please consider allowing Autoblog. Allow Us! Here's how to disable adblocking on our site. Click on the icon for your Adblocker in your browser. A drop down menu will appear. Select the option to run ads for autoblog. But if the mechanic cannot find the cause of the code with either of these two tests, then chances are, there is an issue with a sensor.
But if all these tests have been performed, then your mechanic may decide that the source of the P code may be the powertrain control module.
You can drive your vehicle with P for a small period of time. Given these issues and conditions, it is a good idea to get this trouble code diagnosed and fixed as soon as possible. The remedy to fix your P code my lie in the replacement of your fuel pump. The exact cost does depend on the vehicle make, model and age. Click here to read more! Click here to learn more! The fuel pressure regulator plays a very important role in ensuring that the fuel and air mixture system is maintained at a proper level.
If you have a poor working fuel pressure regulator, then you will have a fuel pump that will push an excessive amount of fuel being pushed into the fuel injectors. Those fuel injectors will cause them to fail. The powertrain control module generally goes by the abbreviation of PCM.
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