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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 10-09-2015, 11:35 AM
roys740 roys740 is offline
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Location: Chi-Town
 
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Mein Auto: 2001 740il
Thermostat Problem

Well I decided to play around with INPA and my car today while at lunch. Found this error code.



Funny thing is there was so Service Engine Soon and Check Engine Light. Car was not running hot and the temp sensor stayed within the normal range. Is this normal?

I guess this weekend I will be buying a thermostat to put it.
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  #2  
Old 10-09-2015, 11:57 AM
Alika808 Alika808 is offline
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The thermostat is bad. The MAP portion is integrated into the thermostat in is controlled by your engine control unit (DME). If you look at the top of the thermostat there an electrical connector/plug. This is the MAP portion that is not replaceable separate.

The mechanical portion is not failed but the electrical heated element controlled by the DME has failed. The DME monitors this and will set a code for the MAP thermostat when it detects a problem.

I recommend to replace with OEM parts.
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  #3  
Old 10-09-2015, 12:20 PM
roys740 roys740 is offline
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What is the brand for OEM thermostat? Can I buy that at of the local auto part stores like Autozone or Pep Boys?
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  #4  
Old 10-09-2015, 04:33 PM
roys740 roys740 is offline
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Looks like Behr and Mahle are OEM according to my dealer. But the want 135.00. OEMBIMMERPARTS wants 78.00. This is gonna be the most expensive thermostat I've ever bought but it is a BMW.
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  #5  
Old 10-09-2015, 06:00 PM
u.nanimous u.nanimous is offline
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Location: SE Michigan
 
Join Date: Oct 2014
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Mein Auto: 1999 740iS, 2001 330xi
While you are in there...make sure you don't have this!
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After...(this may take a few years, it's my DD and I have bigger projects)

2005 Venture Extended LT - what else you gonna drive when you have 6 kids, cargo and still want better than 10MPG
2000 Impala LS - because you need something to beat the snot out of in a Michigan winter
1999 BMW 740i - why do I have Chevy's again?
2001 BMW 330xi - father/son project time!
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  #6  
Old 10-09-2015, 06:08 PM
roys740 roys740 is offline
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ok will take a look tomorrow for sure
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  #7  
Old 10-09-2015, 07:04 PM
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MR.WH1TE MR.WH1TE is offline
MR.WH1TE
Location: Tennessee
 
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Mein Auto: 1997 740i
I was charged 600.00 including labor by the stealership
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  #8  
Old 11-06-2015, 07:37 PM
roys740 roys740 is offline
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Well my thermostat and water pump parts came in this week. Also pick up anti-freeze on sale from Wal-Mart. Will do the job tomorrow.
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  #9  
Old 11-07-2015, 04:14 PM
roys740 roys740 is offline
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This morning I replaced my faulty thermostat. Clear that pesky 140 error code with INPA. Then bled coolant system and then went for a spirited drive. Temps stayed within the normal range, never getting over 103 or 104. Came back and let sit for a couple hours and topped off again. Check for the 140 code and nothing. Looks like I finally got rid of the problem.

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