Q: my 2013 scion FRS is haaving a rough idle and it almost feels like its just going to shut off what can it be?

asked by on August 02, 2017

when my car is on it feels like it is having trouble staying on and a loss of power, when I'm completely stopped it feels like it is going to shut down any minute and it idles very rough at first I thaught it could possibly be the alternator but I got it tested and its good same with the battery. I did receive some trouble codes like camshaft position sensor (no idea if this can cause this issue) and I go another one is read Control module communications bus 'a' off. again no idea what this is.

My car has 57000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. If you are receiving a code for the camshaft position sensor, it is likely causing your loss of power. The vehicle must know where the camshaft is to calculate other engine functions accordingly. A bad reading will cause a major loss of power. You are going to want to start by replacing the sensor, and then scan the vehicle for diagnostic codes again. For more help with this repair and any further testing, contact our service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Grinding noise when steering left in reverse at low speeds.

Hi there. Check the tires and see if they are hitting the frame or the fender. This is a common noise to hear when backing up. Also, there could be a problem with the wheel bearings on the front. Raise...

Not getting smooth shifts anymore but the transmission works

Sounds like you may have a problem with corrosion in the transmission control module, shift module, or in some of the engine sensors. Reading the engine codes would lead to a more specific diagnosis, but checking for corrosion on any...

How do I test which camshaft sensor is bad? My Check Engine Light is on and the scanner says a bad camshaft sensor is at fault.

There is only one cam position sensor on this engine, located just in front of the oil filler cap. Testing camshaft/crankshaft sensor failures, unfortunately, often only has 2 options for testing a suspect component: Replace it with a known...

Related articles

Symptoms of a Bad or Failing Oil Pressure Sensor
Common signs include the Oil Pressure Light coming on or blinking constantly despite oil levels being fine or the oil pressure gauge reading zero.
Symptoms of a Bad or Failing Throttle Body Temp Sensor
Common signs include poor engine performance, stalling, and broken electrical connections.
Can a Bad Sensor Prevent a Car From Starting?
If your car isn't starting or has a hard time starting, a faulty sensor may be to blame. Car sensors monitor data to keep your car running smoothly.