My 1999 bmw z3 will not start , code A9 & 44 shows up air pump keeps running when ignition & drains the battery out while ignition is also:engine light & EML light comes on. will crank but will no

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Feb 18, 2007 - 7 posts - ‎6 authors
HELP 2000 Z3 Battery Drain E36/7 Z3 (1996-2002) ... Something is draining the battery. ... Posts: 55. Mein Auto: 2000 BMW Z3 2.8 Roadster. z3 1.9 battery drain (fuse 31)
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Not sure on this one.....if it's "drive by wire" that means the accelerator pedal is connected to the intake electronically, and that may be where the A9 code comes from. Saturns are drive by wire and it's a common failure point for them. spark, compression and gas is all you need for the engine to run. you can put a fuel pressure gauge on the rail to determine fuel, assume that the compression is good, and pull a spark plug and ground it while cranking to see if gets a spark...

an engine needs fuel, compression, and spark to go....check those things first. Put a fuel pressure gauge on the rail, then remove a plug and ground it to see if it sparks, lastly, run a compression check on it. make sure the cam is turning as well.

Assume you have gas. BMW does not like to start or run if the battery voltage gets too low (for example sitting in the driveway unused. It does not take long with all the electrical drain(computer, security, etc.). A peculiar item about M cars is if the oil gets 3 quarts low, the engine wont start to protect the engine. Other less common camshaft sensor, crankshaft sensor, ignition coil pack, fuel filter, fuel pump. If it does not crank but battery is fine, check the starter. Turn the ignition to ON but not START then if you cannot hear the fuel pump humming, the fuel pump itself or a relay to it is probably bad. Using a rubber mallet, give a couple of sharp blows to the underside of the fuel tank and then try to start. If it starts, fuel pump is bad. Fuel pump is located under the back seat on the passenger side-easy to get to.

The problem sounds like the battery has run down. Even though the ignition is off, things like clocks and the radio draw small amounts of power to retain their settings, and the instrument cluster doesn't draw as much power as the starter. It usually takes about a month or so to drain the battery. Try jump starting the car, or put it on a battery charger for a while.

There is no one fix works on this O2 sensor code
P0170 - Fuel Trim Malfunction Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Hi,
I think that if the battery went completely flat the vehicle may have lost the security code, or the same can have happened if you did not follow the boost charge instructions when starting. If that has happened you'll need to have the unit re-encoded by a dealer. Keep in mind that starting a vehicle periodically is good but if you don't run it as well the battery will become exhausted and finally fail. The start up of any engine drains more power from the battery than any other operation. You need to start it and give it a run.
Regards Johngee10

Hi Peters6709,
Sorry to tell you, but you need to replace the pad-wear sensors as well. They are the little trapezoid pieces that hang inside the tops of the inside pads. They should run about $10 each. Once replaced, disconnect the battery completely for about 10 minutes, if you have a stock radio keep the code handy.

Next time check the pads every 10-12K miles. I have been running the SAME pad wear sensors on my Z3 for the past 2 pad changes now after making the same mistake the first time.

Best of luck!

I would suspect that you pulled a wire off when you were installing the water pump. Check to see if you have spark

if you can heard the fuel pump noise and sure that you have enough fuel, then it may be you have a problem with ignition system or faulty crankshaft sensor.