Skip the auto shop - Our mechanics make house calls

Q: My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code

asked by on

Car was shuttering at high speed, hesitating and died a few times had to feather gas pedal. Code reader says bad mass air flow sensor and crankshaft sensor replaced both and distributor cap that's where crank sensor was. Still code came back same thing took to mechanic said replace mass air flow sensor again. So I did and it seems to run very well no shudder or he station thought I had it fixed . Took it for a run wow way better out 10 miles as fast as it would go not bad. Stopped the car shut it off for 5 min turned on and check engine light on again code reader says mass air again don't understand runs way better wouldn't think I even have a problem exact for that light which I cleared the fault codes. Engine lite Only comes back on after you take it for a drive and shut the car off for a few minutes and restart light then stays on until you clear it. Any ideas???

My car has 195000 miles.
My car has an automatic transmission.

Hi there. The problem you are describing, sounds like you may have a poor connection in the connector at the mass airflow sensor. Although, sometimes aftermarket parts do not perform as well as factory (OEM) parts. Check for corrosion and/or wide spacing in the terminal ends. Compare the terminal ends in the connector using a flashlight to see better. The terminals can be tightened. If you are not comfortable with doing that, a replacement pigtail (connector) is available. You vehicle may require further diagnosis performed with a scanner that provides parameters that can be viewed as the fault occurs. If that is the case, I recommend having your vehicle’s electrical circuits inspected in order to pinpoint the underlying fault.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code

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

Get a quote

What others are asking

Q: What do I do when the MAF isn't creating enough ground to the ECM module?

Hi there. First, check the harness connection on the sensor for any burned or corroded pins. That will cause a restriction and make the power drop. If the harness is good on the plug end, then disconnect the harness from...

Q: Car stalling and then accelerating while driving

Many issues can cause a stalling concern while driving. Ensuring that all of your fluids are at the right fluid level is very important. An inspection should be carried out to make sure that there aren't any fluids leaking from...

Q: My car is slow to accelerate, and it stalls in drive and reverse

This may be related to a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.