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 1,000 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: My car shuts off when driving?

Hi there. If you already replaced the camshaft position sensor and the engine light comes on with the codes for the same issue, then the Mass Air Flow sensor (MAF) could be defective or dirty. Remove the MAF and clean...

Q: Stalling in any gear

Quite a few faults can cause the vehicle to stall and not be able to run properly. The most common problems is a failure with the fuel pump, alternator, fuel filter, MAF sensor, vacuum leak, or exhaust leak. I'd suggest...

Q: Every morning or when I use my truck i put it on drive I press on the gas and the engine will rev up but the truck goes very slow

Hello. I have a couple of ideas. You mentioned it happens in the morning and this indicates the truck is cold. When the seals in a transmission get old and hard, they allow ATF to leak internally and the transmission...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...