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.

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 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. Car will crank, doesnt stay running

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: P0107 MAP Sensor OBD code

Hello - if this condition came on slowly - period of weeks or months - I would be checking for low compression and/or a clogged catalytic converter (especially if this is the original converter). Low airflow under a load may...

Q: Tranny troubles

You need to have the transmission leak from the bell housing fixed. The fluid leaking is causing the transmission shift problem. The trouble code P2271 indicates that the O2 sensor after the converter shorted rich. This may happen if transmission...

Q: How long can I drive on the spare donut tire originally provided with car?

A general rule of thumb is to not drive on this spare doughnut tire for longer than ~+/-70 miles or driving faster than 50 mph. These tires are not designed with much tread on them and will wear out very...

Related articles

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.