Skip the auto shop - Our mechanics make house calls

Q: Immonbiliser

asked by on

I went to my car the other day and the central locking didn't work. Opened the door and the internal light didn't come on. I then tried to start it and the green key was flashing so it wouldn't start. Tried the spare key and the same. Then all of a sudden central locks worked and I could start the car. Drove the car and the brake light stayed on all the time, yet the seat belt light didn't come on at all. Parked the vehicle up, tried again and it wouldn't start. Since then it has worked on one occasion then not !

My car has 110000 miles.
My car has a manual transmission.

Hi there. Believe it or not, it sounds like you may have a bad battery. If a cell in the battery has failed or has tilted it can create a host of electrical problems. Before replacing anything, have the battery tested with a digital battery tester that provides current voltage, cold cranking amps, and state of health; replace as necessary. If the battery is at fault and is replaced, there may be some "handshake" procedure for the smart key system to initialize. If the battery tests ok then I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with an electrical problems inspection.

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

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: System Emissions Problem

Hey there. With the vehicle being brand new, typically there is a warranty and you can take it back to the dealership. The sensor may have failed. If resetting it had an effect on the light, then that means the...

Q: Car overheating for some reason.

Hi there, there are several reasons as to why a car can overheat in traffic. Some of the things you mentioned are important context clues that may help rule some things out. The white smoke you mentioned NOT seeing is...

Q: Key not turning in ignition

Hi there. The key in your car can be kept from moving for many of different reasons. You should start by pulling the steering wheel in both directions while trying to turn the key. If the wheel is held too...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.