Skip the auto shop - Our mechanics make house calls

Q: Car will crank, doesnt stay running

asked by on

I checked the car with a code reader and it read out p0107. I followed the steps to test the map sensor and the voltage decreases with vaccuming and increases when let off. If the sensor is good should i replace the wiring harness that connects to the sensor cuz i noticed that one of the prongs was pushed down, not sure if theres a good connection or not. I did check the middle wire and it read 5 volts what else could the problem be a leak in the vaccuum hose or ? Well theres one thing i haven't tested and thats the ground wire, not sure if its 12 volts or not. Please help

My car has 220000 miles.
My car has an automatic transmission.

A: Hello and thanks for your question. Ground...

Hello and thanks for your question. Ground wires will not have a voltage on them. Preform a resistance check on all of the pins to the harness plug. There should be resistance for the computer, high resistance for the power, an no resistance for the ground. If there is bent pin or the prong was pushed down, try to push the pin or prong back up. Do not break the prong. Then reconnect the harness to the sensor and remove the ground cable to the battery to clear the codes. Reconnect the battery and retest to see if the engine light comes back on. If the light stays off, then the prong was the issue. If the engine light comes back on, then there could be an issue with the ground or the harness. Check both ends of the harness before replacing it. I recommend having a professional, preferably a YourMechanic professional to help you with your vehicle.

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!

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: Steaming of the engine

Hi, thanks for writing in. Codes P0107 and P0122 could show up for several reasons, such as a faulty mass air flow sensor. If you would like help, consider having an expert automotive technician from YourMechanic come to your home...

Q: check engine light is on

A fault code p0304 is typically caused by a faulty plug or a failed ignition coil. If it has been quite a while since there has been a tune up done, I would start there. Many times a misfire can...

Q: Car keeps breaking down

What I believe has happened is that the mechanic you went through lied to you. Based on his directions for you after the fuel pump replacement, it sounds like the original fuel pump was actually the correct size and that...

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...
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...
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.