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BMW 745Li Won't Start

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my BMW 745Li won't start?

While there are a variety of reasons your BMW 745Li won't start, the most common 3 are a dead battery, an alternator problem, or failed starter.
38%
of the time it's
Battery
27%
of the time it's
Alternator
20%
of the time it's
Starter

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What to expect at the repair shop when your BMW 745Li won't start

How is a no-start diagnosis fixed?

Correcting most no-start problems usually involves replacing the alternator, starter or battery, cleaning connections, ignition system repairs, or fuel system repairs. But because there are so many potential causes, the diagnosis is key to understanding how expensive the repair will be.

RepairPal Recommendations for a no start diagnosis

When a vehicle doesn't start it can be for many reasons. To avoid replacing unneeded parts we recommend having a professional perform a diagnostic test to identify the root cause of the problem.

What to look out for with a no start diagnosis

Diagnosing modern automotive systems without proper knowledge and training can be frustratingly difficult, but without proper technique the diagnosis will only be reached through changing parts on a hunch. Automotive systems, especially in the last 10 years, have become extremely advanced, and most vehicles have a communication network that allows all of the systems to communicate. This is a blessing for the trained technician, and a curse for the DIYer who would rather save money on the repair.

Related BMW 745Li Questions

See what others are asking about their BMW 745Li. Get answers from RepairPal's community of auto experts and enthusiasts.
I bought the car and the owner said it used to die but start back up but it got worse and won't start at all. gauge s...
Do you think it could have somthing to do with the oil
BMW 745Li Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

BMW 745Li Won't Start Repair Symptoms

The battery is considered dead when there isn't enough charge to start the engine or run electrical components. Normally, the first sign is dim lighting in the interior of the ...Read More
If the fuel pump leaks or begins making a lot of noise, get it looked at right away. A failing fuel pump will not create enough pressure in the fuel system, possibly causing a l...Read More
When the electrical portion of the ignition switch fails, the vehicle will permanently or intermittently lose power to certain systems and components, depending on which positio...Read More
When the ignition switch lock cylinder fails, it can create a situation where the ignition cannot be turned, or takes much wiggling and shaking before it finally turns. Or, it's...Read More
Starter motor failure produces one common symptom across all makes and models: When you turn the key, the starter solenoid will click, but the engine will not rotate. You also ...Read More
When the computer senses the engine is out of time, it will turn on the check engine light. The engine may stall or even just fail to start. If the engine runs, it will run poo...Read More
When the computer senses the engine is out of time, it will turn on the check engine light, and the engine may start and stall, or fail to start at all. If the engine runs, it w...Read More