Skip the auto shop - Our mechanics make house calls

Q: car crank not start, 2004 BMW 745i

asked by on

Hi, I have a 2004 bmw 745i and it recently broken down. I got a fault code P1727. this car can crank but no start. please what this fault code meaning. thanks

My car has 100000 miles.
My car has an automatic transmission.

A: The code you listed, P1727 indicates that t...

The code you listed, P1727 indicates that the engine speed sensor is not providing a signal to the computer. Without knowing the position of the crankshaft, the ECM does not know when to inject fuel or when to ignite a spark. Further electrical tests can confirm the sensor is failing. If you need help with testing and repair, a certified technician, like one from YourMechanic, will be able to test the sensor to diagnose the no start and guide you with the next steps.

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: Sometimes my car accelerates very slowly but the RPM rises

Hello. I would recommend first checking the connections to the MAF sensor and cleaning it as sometimes they will get dirty and cause this kind of problem. If this does not work you may need to have it replaced. If...

Q: Hey I have just recently changed over a timing belt on my g-f's mazda bubble car engine is a b3 (1.3l) then it snapped on us.

Hi there. If the timing belt broke a short time later after replacing the timing belt, then check the water pump and the timing belt idler pulley. The water pump may be failing causing the gear on the water pump...

Q: My alternator has failed and now my car is dead

Let's check the basics on this one. It seems like you are saying the alternator died and was replaced with a new one. For the alternator and charging system to operate correctly, the battery must be tested and healthy and...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...