2012 x5d, mpg dropped to 18

007_e350 · 05-30-2015, 08:31 AM

With summers it should get somewhat better, we were averaging 21 combined till 2 weeks ago, it's now 18 and I get 400 miles to a tank vs 480 before... This is the 2nd tank fill up with same mpg, wonder if it's the thermostat thing causing this, read a post on here abt the 88 degree TS going bad and throwing off mpg, anyone else experiencing this

PS: also been raining all along would that cause this, I don't think so

smyles · 05-30-2015, 11:38 AM

Well, have you checked the thermostat?

serge1 · 06-01-2015, 12:52 PM

Very easy to check thermostat (but hard to find good instructions, so here you go!):
1. Add up the last 5 or 6 digits of VIN (mine ends up to be "20").
2. With ignition on (or even engine running), press and hold the odometer reset button (the button on tacho and speedometer glass)
3. If engine is running, a "!" symbol will appear briefly after 7 seconds, keep holding until you see bunch of cryptic numbers and letters
4. Repeatedly press the button and go to "19" and stop; it will ask for code
5. Repeatedly press the button to enter code (mine is 20) and stop
6. Repeatedly press the button to go to "7" for thermostat temperature.
Start driving and monitor the temperature.

007_e350 · 06-01-2015, 01:59 PM

Quote:

Originally Posted by serge1

Very easy to check thermostat (but hard to find good instructions, so here you go!):
1. Add up the last 5 or 6 digits of VIN (mine ends up to be "20").
2. With ignition on (or even engine running), press and hold the odometer reset button (the button on tacho and speedometer glass)
3. If engine is running, a "!" symbol will appear briefly after 7 seconds, keep holding until you see bunch of cryptic numbers and letters
4. Repeatedly press the button and go to "19" and stop; it will ask for code
5. Repeatedly press the button to enter code (mine is 20) and stop
6. Repeatedly press the button to go to "7" for thermostat temperature.
Start driving and monitor the temperature.

thanks a bunch!!

Flying Ace · 06-11-2015, 02:32 PM

Quote:

Originally Posted by serge1

Very easy to check thermostat (but hard to find good instructions, so here you go!):
1. Add up the last 5 or 6 digits of VIN (mine ends up to be "20").
2. With ignition on (or even engine running), press and hold the odometer reset button (the button on tacho and speedometer glass)
3. If engine is running, a "!" symbol will appear briefly after 7 seconds, keep holding until you see bunch of cryptic numbers and letters
4. Repeatedly press the button and go to "19" and stop; it will ask for code
5. Repeatedly press the button to enter code (mine is 20) and stop
6. Repeatedly press the button to go to "7" for thermostat temperature.
Start driving and monitor the temperature.

helpful, thank you!

goodmaj · 06-11-2015, 07:24 PM

Quote:

Originally Posted by serge1

Very easy to check thermostat (but hard to find good instructions, so here you go!):
1. Add up the last 5 or 6 digits of VIN (mine ends up to be "20").
2. With ignition on (or even engine running), press and hold the odometer reset button (the button on tacho and speedometer glass)
3. If engine is running, a "!" symbol will appear briefly after 7 seconds, keep holding until you see bunch of cryptic numbers and letters
4. Repeatedly press the button and go to "19" and stop; it will ask for code
5. Repeatedly press the button to enter code (mine is 20) and stop
6. Repeatedly press the button to go to "7" for thermostat temperature.
Start driving and monitor the temperature.

Ah ha! I was wondering if these cars had the secret menu a la what my previous cars had. Is there a full decode/guide posted somewhere?

bmwx5er · 06-11-2015, 11:51 PM

Quote:

Originally Posted by goodmaj

Ah ha! I was wondering if these cars had the secret menu a la what my previous cars had. Is there a full decode/guide posted somewhere?

Here you go:
http://www.scoopz.com/m5board/E60_Hi...structions.pdf

05-30-2015, 08:31 AM	#1
007_e350 Lieutenant Colonel 217 Rep 1,909 Posts Drives: 335i 2008 MHD'd / x5d E70 Join Date: May 2013 Location: left lane iTrader: (3)	2012 x5d, mpg dropped to 18 With summers it should get somewhat better, we were averaging 21 combined till 2 weeks ago, it's now 18 and I get 400 miles to a tank vs 480 before... This is the 2nd tank fill up with same mpg, wonder if it's the thermostat thing causing this, read a post on here abt the 88 degree TS going bad and throwing off mpg, anyone else experiencing this PS: also been raining all along would that cause this, I don't think so __________________ Mods: 7" VRSF FMIC, Forge DVs, RB PCV, BMS Oil Cooler, VRSF DPs, MHD, JB4g5, OFT DIYs: Walnut blasting : Trans Oil at 45k, w Filter at 65k : Diff Oil Flush @ 45k : WP&TS @ 69k : Alternator @ 79k --- E70d Alphabet Soup del 44.4k : JR Stg2.25 tune : Buzzken Catted Exhaust : Trans fluid drain/ fill (3 Qrts), both Diffs fluids flushed Wheels: Style 95s on PSSs (Sold): AG 359s on S04s : 162s on Blizzaks : Rohana RF1 Matt black
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05-30-2015, 11:38 AM	#2
smyles Major 1023 Rep 1,168 Posts Drives: '21 X5 Join Date: Jan 2012 Location: DC iTrader: (0)	Well, have you checked the thermostat?
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06-01-2015, 12:52 PM	#3
serge1 First Lieutenant 32 Rep 389 Posts Drives: X5 35d Join Date: Oct 2011 Location: Seattle iTrader: (0) Garage List 2011 BMW X5 35d [0.00]	Very easy to check thermostat (but hard to find good instructions, so here you go!): 1. Add up the last 5 or 6 digits of VIN (mine ends up to be "20"). 2. With ignition on (or even engine running), press and hold the odometer reset button (the button on tacho and speedometer glass) 3. If engine is running, a "!" symbol will appear briefly after 7 seconds, keep holding until you see bunch of cryptic numbers and letters 4. Repeatedly press the button and go to "19" and stop; it will ask for code 5. Repeatedly press the button to enter code (mine is 20) and stop 6. Repeatedly press the button to go to "7" for thermostat temperature. Start driving and monitor the temperature.
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