2003 BMW318I WHERE IS THE CRANKSHAFT SENSOR

About the only thing you have left is the Timing Belt and it's not uncommon. I recommend you get a timing belt kit they come with everything you need.

is it getting spark? auto shutoff relay..

let vechicle sit for a while could be flooded fuel injectors leaking.when fuel injectors become dirty clogged they will leak when you turn off the engine.see if engine restart if its sits while.if car still dont crank check for spark.no spark could be faulty ignition module or crankshaft position sensor and camshaft sensor.have vechicle code scan first before buying new parts.meant to say bad engine coolant temperature sensor will cause no start hot engine and clogged air filter.

flooding out
incorrect injectors or bad injector seals

If the Starter isn't turning the engine over, but you hear a clicking sound, you may have a bad Starter.
If the Starter is turning the engine over, but you are getting no Spark, you may have a failed Camshaft or Crankshaft Position Sensor, or your Timing Belt may have jumped or broken(common on the neons).
If the Starter is turning the engine over, but you are getting Spark, you may have a failed fuel pump, fuel pump relay, or fuel pressure regulator.

Before you start replacing sensor, double check the Timing belt to ensure it hasn't broken or jumped, and check to see if you are getting a spark or not.

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The crankshaft position sensor (CKP) and Camshaft position sensor (CMP) work in harmony to control the spark/fuel delivery and timing. They both consist of a reluctor, or tone, ring which passes over a magnetic sensor, which generates a voltage, indicating position.

The crankshaft sensor is part of the primary ignition system and functions as the "trigger". It detects the position of the crankshaft relays that information on to the PCM or the ignition module (depending on the vehicle) to control spark timing. The Camshaft position sensor detects the position of the camshafts and relays the information to the PCM. The PCM uses the CMP signal to identify the beginning of the injector sequence. What ties these two shafts and their sensors together is the timing belt or chain. The cam and crank should be precisely timed together. If the PCM detects that the Crank and Cam signals are out of time by a specific number of degrees, this P0016 code will set.

Symptoms of a P0016 will or may include:
* Malfunction Indicator Lamp (MIL) illumination
* The engine may run but with reduced performance
* The engine may crank but not start
* The engine may exhibit a rattle near the harmonic balancer indicating the tone ring is damaged
* The engine may start and run, but poorly

Causes may include:
* Timing chain stretched, or timing belt skipped a tooth due to wear
* Misalignment of timing belt/chain
* Tone ring on crankshaft slipped/broken
* Tone ring on camshaft slipped/broken
* Bad crank sensor
* Bad cam sensor
* Damaged wiring to crank/cam sensor
* Timing belt/chain tensioner damaged

Possible Solutions:
1. First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
2. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
3. If the signal appears normal, then check the timing chain/belt for proper alignment. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched. Repair and recheck.

Other crank sensor codes include P0017, P0018, P0019, P0335, P0336, P0337, P0338, P0339, P0385, P0386, P0387, P0388, and P0389.

Hope helps.

The ECU requires timing pulses from the crankshaft and camshaft sensors in order to generate the injector pulses. All other sensors just modify the pulse width of the injectors to adjust for power and economy. If the ignition is entirely controlled from a distributor, the two above sensors would not affect the spark. Hope this helps!

The crankshaft position sensor works in tandem with the camshaft ones, and they sometimes fail together. I've seen it written that the crankshaft one should be changed WITH the cam ones. They're kinda expensive, but the no spark/injection thing suggests that may be your issue. <!-- from fixya rte -->

If your car is injected it maybe the crankshaft position sensor or the throttle position sensor. Get then tested or replace them.

I had a problem like this on a 1997 VW Jetta 2.0L. I suggest you obtain a multimeter, a gas pressure gauge, and a used injector from a junk yard. You need to find if the car has spark if it is getting gas and if the injector is firing. Plug a used spark plug into say # 4 spark plug wire and ground end against the manifold or other ground. Have someone crank the engine and see if there is spark. If there is spark then disconnect the electrical connector and plug in the used injector and hold in your hand. Have someone crank the engine and if it clicks as the engine revolves the injector is firing. Now if you have spark and an injector that clicks then put the pressure gauge in the upper line going to the injector manifold. Use a T so that the fuel can still flow into the manifold. If these three things check out. You need to also verify the engine is timed correctly and the timing belt did not slip a few teeth. I had a problem with my crankshaft sensor. I bought a new one and although I was getting about a .3 volt ac signal, I still had no spark at spark plugs. I wound up getting another new crankshaft sensor and read 3 volts ac from the new sensor. I then had good spark Hope this helps