Q: Do I need a crankshaft position sensor

asked by on

Car runs fine at traffic lights it idles a little rough,,had tune up ,mass airflow sensor replaced

My car has 170000 miles.
My car has an automatic transmission.

Typically a bad crank position sensor will prevent your vehicle from starting. Your rough idle could be due to a vacuum leak or possibly a dirty injector, or maybe even an idle air control valve or throttle body that needs cleaning. If you notice the problem getting worse, I would recommend having a certified technician, like one from YourMechanic, come to your home or office to diagnose your rough idle and make the necessary adjustments or repairs.

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
  1. Home
  2. Questions
  3. Do I need a crankshaft position sensor

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 alternator belt keeps breaking what could cause this

Hi Paula. Thanks for contacting us today. 95% of the time, frequent alternator or serpentine belt breakage is caused by either faulty pulley's or misaligned or un-properly adjusted belts. Belts that are not properly adjusted to tightness can also explain...

Q: Very low idling during cold start, stalling engine, 2007 Toyota Corolla

The first thing you should do is scan the engine and repair any codes. Have the fuel vapor system checked to make sure you do not have any problems with a leaking purge valve leaking vapor into the intake when...

Q: Lost brake & power steering pressure

Hello there, a few different items can cause a decline in the brake pedal movement and the steering to be stiff. The most likely would be the hydroboost, brake master cylinder, or power steering pump. The hydroboost system adds pressure...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...