Q: codes p0101 and p0303 simultaneously

asked by on July 20, 2016

I continue to get codes p0101 and p0303 when throttle is near wide open on highway on ramp (60-70mph). The fuel pump, filter, plugs, wires, cap, rotor, injector spider, and delco ecm have just been replaced in an attempt to correct this condition. The engine runs smooth until this speed, when you can feel a shudder and the check engine light illuminates. Cylinder 3 has 185 psi compression check, and continuity was checked on ecm etc.

My car has 240000 miles.
My car has an automatic transmission.

Mass Airflow Sensor Replacement $188.36 - $786.53 Get a Quote

The code P0101 is for a problem with the MAF sensor and code P0303 is for a cylinder number 3 misfire. The first thing to check is to make sure there is no vacuum leaks or leaks between the MAF and the throttle body connection hoses. The MAF may be giving an incorrect input to the computer causing the misfire and MAF code. Have the MAF code pinpoint test done and replace the MAF if it fails the test.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car not cranking.
One thing that may have happened if the engine was flooded is that the cylinder walls may have been washed down by excess fuel. Once this happens the engine has a distinctly different sound when starting. Also, even spraying starting...
How do I manually adjust the side view mirrors?
The side view mirrors are important safety features that provide extra visibility to the driver. Before driving, it’s important to adjust the side view mirrors so that you have maximum visibility. The manual side view mirrors are adjusted with the...
Car gets very low gas mileage
I would do a little quick research and find out what is typical real-world MPG for others who drive your make and model. That will provide you a realistic base-line expectation that will be more accurate that Mazda or EPA...
Broken hub bearing
You are absolutely correct. If the vehicle even gets raised up off of the ground the front wheels should be shaken down to see if any play exists. This is especially true if the tires were being replaced. There is...
Does the dipstick tube just pull out of the block or are there retaining clips?
To answer your first question: yes, it does have a bracket on the oil dipstick tube but, if you remove the bracket, it will pull out. Your dipstick is going to have some curves in it; this is normal for...
Smashed Car Door
I would recommend to call around to your local body shops to ask for quotes on the repair that is necessary. Based on the sound of the damage, the repair will likely involve replacing the door in order to get...
What is this part called ?
The round disc you see is just a rubber plug that covers the access port to the transmission torque converter drain plug. If you are leaking oil from this location you will need to first see if it is engine...
Engine shakes intermittently after warmed up with car in "drive" at a stop. Single shakes at a time.
Hi there. There could be an issue with the fuel system or with the ignition system on your vehicle. It seems that the engine is having a minor misfire. Check the spark plug wires and see if any of them...
Lack of response when stepping on the gas.
Your engine has a couple sensors that can cause the symptom you talk about.You should have the computer scanned for codes first and then the datastream can be looked at to see if the computer is losing input from the...

Related articles

The Best Used Cars to Buy That Can Be Towed Behind an RV
Summer Summer is a great time for a road trip, but often travelers like bringing all the conveniences of home along, in the form of an RV. Then they tow their car behind it – sometimes this practice is called...
Symptoms of a Bad or Failing Injector Control Pressure Sensor
Common signs include starting issues, engine misfires, the Check Engine Light coming on, and a decrease in power, acceleration, and fuel economy.
How Long Does a Valve Cover Gasket Last?
Among Among the most important parts of any engine is the oil that is contained within it. There are a variety of moving parts that depend on the oil for lubrication. The valve cover goes on top of the engine...