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Water leak check:
1. Plenum chamber leaks at loom exits (Accident damage or corrosion)
2. Water leak at air con fan inlet (Accident damage or gasket wear)
3. Water leaking from air con heater pipe (corroded water pipe to/from heat exchanger)
probably a hose, take it to a mechanic and ask if you can get it pressure tested. They will put a cap on your radiator and pump air through it and the water with run through and leak where there is a problem
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
One of the most common problems I see with the Z3 water leaks in the trunk comes from the 3rd brake light lens. You can open the lid, and check for a leak while pouring a little water around the lens. Another common leak is from the trunk seal itself. Look for tears,holes and any deformities in the gasket. The is a slight probability the antennae base could be leaking. The rubber based should not look cracked or deteriorating.
it wont be a dip stick as such it will be a single bolt on the side of the gearbox remove this then top up the gearbox until the oil starts weeping out of this hole wait for it to stop leaking then replace the bolt job done!
I have the same problem with my Z3 alarm going off, a local BMW specialist has traced it to the pitch sensor which has been damaged due to a water leak, the wires are also corroded. They have quoted £200 to fix it, but advise that the water leak is sealed first because it'll just get damaged again. I've had a look round and it appears the water is getting in by the off side light cluster via the boot gutter.