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Old 04-13-2009, 09:02 PM   #1 (permalink)
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Question 'Service Engine Soon' Light of 2000 540I - P1622

Ok guys, you were very helpful on the last one - here is another one of those 'lights' questions for 540I (I wish I could turn them all off!).

I have been having the 'low coolant' message on and off. I checked it twice but the level was fine. Last week I got the 'service engine soon' and went to Autozone - they told me it was P1622 but could not reset it.

I added some coolant (just in case) but the light is still on. Should I reset it and if so, how? From Autozone they told me they could not do it (not sure why, they used to to that with my 99 Passat). Would I expect the light to go off on its own (when I fix it or does it need to be reset necessarily - if so, how)?

Someone had mentioned on the boards that this is most likely thermostat (that is going bad, had gone bad). What would be the sympthoms for that? The car seems to be running fine, engine temp is in the middle...

Thanks anyone and everyone who can help out!

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Old 04-15-2009, 02:30 AM   #2 (permalink)
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Nah, coolant level sensor, as for the reset it may go away when you put a new sensor in or after you have replaced, you could try disconnecting the Batt for 10 minutes neg off 1st and pos back on 1st also make sure you have your radio code you may or may not need it.
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Old 04-15-2009, 07:50 PM   #3 (permalink)
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I see the point on the Coolant Sensor and thanks for the tip on the battery - I was thinking about trying this, so I see I was not the only one...

Here is what I got at another message board (different site)

'My Bentley say that P1622 is "Map Cooling System Thermostat Control Circuit Electrical'.

What does that mean in English - I need to replace the thermostat? Can I drive like that for another week or two? (until the part arrive?). I am not sure what the risks are - overheating?

Thanks again!

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Old 04-17-2009, 08:57 PM   #4 (permalink)
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The Bentley message just means that the fault code is somewhere in the thermostat electrical circuit. How many electric parts are there in that circuit, probably just the sensor - so that's all. Whether or not your thermostat needs replacement you can tell by the engine temperature - usually they get stuck open, so the car doesn't warm up very well. If it is stuck closed it will get HOT and you'll see it on the gauge. As far as reset goes, the car may actually reset itself once the problem has been fixed and it has been driven for a while and has done another 'diagnostic check' on itself (they do this all on their own) and it finds that the error no longer exists.
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Old 04-18-2009, 10:16 AM   #5 (permalink)
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Thanks for the message - it makes a lot of sense!

The car seems to be fine, temp wise (warms us normally and than stay in he middle), so most likely the thermostat is ok. Where would that sensor be - somewhere close to the thermostat? I am thinking about replacing it to see if this will cause the error to go away.

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Old 04-18-2009, 10:56 AM   #6 (permalink)
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The coolant level sensor is under the expansion tank, it just twists approx 10-20mm or it might be like a nut and unscrew and pulls out (un plug connector 1st), you will lose some coolant. It wont be the thermostat sensor as your gauge is fine.

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Old 04-18-2009, 10:31 PM   #7 (permalink)
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Thanks, man. I did unplug the battery as you suggested and this reset the light. I will wait and see if it comes back on and then will potentially replace the coolant level sensor - seems like this is causing this. Thanks again and I appreciated the adivice - both were definitely useful!

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