Bad crank sensor bmw alternators 128i fans crankshaft sen...

Q: Bad crank sensor

asked by on July 22, 2016

My car has gone around 120,000 miles. At the dealership I was told that I have a bad crank sensor. It was supposedly caused by a broken fan, as a result of a rock being stuck in the alternator. I took the car to a mechanic I know and he told me there is a small likelihood of that happening. I'm reluctant to fix something that isn't necesssary, especially because it is not under warranty. How can I know for sure?

Hello. Just about anything is possible but it is unlikely. I have seen crank sensors go bad and cause many issues, but if you are not having any other issues then I think that it is unlikely. If I knew what the issues were with the car I could tell you for sure.

If you want a second opinion, consider YourMechanic, as a certified mechanic can come to you home or office to diagnose and ]replace your crankshaft position sensor](https://www.yourmechanic.com/services/crankshaft-position-sensor-replacement) if necessary.

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

Service park assist is displaying on dash

Hello, and thank you for writing in. Your vehicle is equipped with the Park Assist feature which will help you park in difficult situations. When the computer system detects there is an issue, the warning light illuminates to let you...

High beams come on whenever I use my right turn signal 2008 Pontiac Grand Prix

The problem is caused by a short in the turn signal switch. Replace the turn signal switch.

Noticed car leaking after alignment.

Hi there. It is not too common for a transmission service to cause a leak on this vehicle unless something was left loose. If there is a lot of fluid then the area needs to be cleaned and monitored to...

Related articles

Is It Unsafe to Continue Driving a Vehicle with Broken Wheel Speed Sensors?
Car wheel speed sensors are an important safety feature. It helps the ABS system work when you need to make an emergency stop.
How a Modern Engine Works
You You turn your key in the ignition, and the engine fires up. You press the gas and the car moves forward. You take the key out and the engine turns off. That’s how your engine works, right? It's a...
What Sensors Make the ABS Work?
When When we are discussing ABS systems it is good to note the year and make of your vehicle because ABS systems have evolved quite a bit over the years, but you also have to know how the ABS system...