Advice, comments very welcome! Thank you. I check fluids often and I still have the temp gauge so I’m not too worried, but I hate to kludge things. Hopefully someone can shed some light, else I will just make the jumper wire permanent and avoid this headache. How on earth did the system get so jacked from just a simple tank and sensor replacement and why can’t I clear this message via some standard procedure? I have the opposite – when a magnet is near, the switch closes and the system is happy – message goes away. In other words, normally as the float dropped due to a coolant loss, the magnet would come down to the vicinity of the sensor the switch would close and the message would appear. Inserted jumper wire into harness socket: message went away.īased on this, somehow my system seems to be in a mode where it is operating backward. There IS such a code for Low Oil Level > 1 Liter. AFAIK, there is NO DTC or Fault Code related to Low Coolant. Issues with the vehicle’s engine management system, such as a. 1) in the X112 Connector at the Switch, or the Brown/White wire between X112/2 and X14271/54 2) a faulty chassis ground (Brown/Black wire) or. Some common causes include: Problems with the vehicle’s emissions control system, such as a faulty oxygen sensor or catalytic converter. Removed sensor from harness: message remained.Ĥ. There are many different things that can cause the Service Engine Soon or Check Engine light to come on in a BMW vehicle. Condition #1 above, then put a magnet on the sensor: message went away.ģ. Pulled the sensor out of the well but still attached to the harness: message remained.Ģ. 08 X3 3.0Si - AT - Black with black leather interior - 136k miles. 07 X3 3.0Si - AT - Black with tan leatherette interior - 148k miles. The electric fan does not work, but its not been a problem as I live in a fairly cold climate.Update – here’s the troubleshooting steps I did:ġ. My 08 low coolant light turned out to be the expansion tank, again, but my 07 has a tiny leak at the bottom of the radiator, that is being monitored. Instead its the opposite.Ĭar has 185,000 miles and the radiator and expansion tank have been replaced fairly recently. As the engine comes to temperature, the coolant expands and the light should go off (unless the coolant is really low). I assume that the light would come on immediately when the engine is cold if the level is actually low. This is the opposite of what I would expect. No leaks and the system has been pressure tested. Just unplug it and tape both the sensor receptacle and the pigtail well and check your coolant every month and look for leaks under the vehicle. I have had no overheating problems (lately). Enough of this oil in the coolant, corroded sensor, worn out this and that, Dexcool (which is the best theory), crossing a 2000 ohm resistor over the contacts. The temperature holds completely steady the entire trip. The coolant light remains off while the car comes up to temperature but comes on during the highway phase of the trip and goes back off when I return to city driving at the end of the trip. Here's an example of how the coolant level light behaves: My daily commute includes about 5-10 minutes of city driving at each end with highway in between - Total of about 25 miles/35 minutes. The coolant level in the expansion tank looks fine when I check it cold (dip stick floats at the top of its range - about 1-2 inches above the level of the fill opening - actually I am concerned that I have over-filled). I've been puzzled by a low coolant light that comes on intermittently on my 2000 323i.
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