2018 F36 420i

Craig380 · 11-28-2019, 06:13 AM

Hi,

on Sunday the amber 'check engine' light lit up solid (not flashing) and has stayed lit. I did some checks, and:

- there was no message in the dash display
- 'Check Control' shows 'no faults'
- No trouble codes stored in the DTC hidden menu
- Engine running fine, full performance
- Oil level shows 75% full
- Gas cap was secure
- Service is due in 1,300 miles but was not getting the 'book service now' message

Anyone have any ideas what the CEL could be caused by? I've booked the service anyway and mentioned the CEL.

Thanks for any pointers.

Billfitz · 11-28-2019, 07:52 AM

75% is low on oil. With a 5 liter capacity that means you're down 1.25 liters.

ChuckP49 · 11-28-2019, 08:30 AM

That happened to me last year, after checking everything I could I made an appointment with the local Dealer.....bad O2 sensor. Replaced under warranty.

Craig380 · 11-28-2019, 10:30 AM

Quote:

Originally Posted by Billfitz

75% is low on oil. With a 5 liter capacity that means you're down 1.25 liters.

To be clear, after doing a full oil level measurement, the display showed the level was three-quarters of the way to the 'max' mark. I thought it was only 1 litre from the 'min' to the 'max' mark on the display?

Billfitz · 11-28-2019, 11:50 AM

Even if you're down one liter that's about a half liter more than I'd be comfortable with. You should check the engine thoroughly for leaks. BMW engines don't burn oil, but they're notorious for leaking gaskets, especially on the oil filter housing and valve cover.

sygazelle · 11-28-2019, 12:28 PM

Call Penny. Maybe she knows.

psyki · 11-28-2019, 01:08 PM

Are you able to check the codes with ISTA?

Craig380 · 12-10-2019, 07:13 AM

A quick follow-up to conclude this thread. 5 days after it popped up, the CEL disappeared and did not reappear. Still no fault codes stored.

The car has just had its first service, and during the inspection they found an emissions irregularity. Oxygen sensors were good, but an endoscope inspection in the exhaust showed the catalytic converter matrix had partially broken up internally. There was no external damage or impact to the cat can. Being replaced under warranty.

SteveInfante · 12-11-2019, 10:23 PM

Mine just did this the other day once I hit 66,666 miles. Checked all the same things. Disappeared now so I guess I will schedule an apt for tomorrow to have them check it out. I was thinking something emissions.

11-28-2019, 06:13 AM	#1
Craig380 New Member 15 Rep 13 Posts Drives: 225xe, 420i GC Join Date: Sep 2019 Location: Macclesfield iTrader: (0)	2018 F36 420i - 'check engine' light but no fault codes Hi, on Sunday the amber 'check engine' light lit up solid (not flashing) and has stayed lit. I did some checks, and: - there was no message in the dash display - 'Check Control' shows 'no faults' - No trouble codes stored in the DTC hidden menu - Engine running fine, full performance - Oil level shows 75% full - Gas cap was secure - Service is due in 1,300 miles but was not getting the 'book service now' message Anyone have any ideas what the CEL could be caused by? I've booked the service anyway and mentioned the CEL. Thanks for any pointers.
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11-28-2019, 07:52 AM	#2
Billfitz Lieutenant General 8239 Rep 16,075 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	75% is low on oil. With a 5 liter capacity that means you're down 1.25 liters.
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11-28-2019, 08:30 AM	#3
ChuckP49 Private 37 Rep 71 Posts Drives: 2016 435i xDrive Gran Coupe Join Date: Jul 2017 Location: Monroe, North Carolina iTrader: (0)	That happened to me last year, after checking everything I could I made an appointment with the local Dealer.....bad O2 sensor. Replaced under warranty.
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11-28-2019, 11:50 AM	#5
Billfitz Lieutenant General 8239 Rep 16,075 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Even if you're down one liter that's about a half liter more than I'd be comfortable with. You should check the engine thoroughly for leaks. BMW engines don't burn oil, but they're notorious for leaking gaskets, especially on the oil filter housing and valve cover.
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11-28-2019, 12:28 PM	#6
sygazelle Brigadier General 11346 Rep 3,406 Posts Drives: 2014 328i M-Sport, 2019 X5 40i Join Date: Sep 2010 Location: San Francisco iTrader: (0)	Call Penny. Maybe she knows.
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11-28-2019, 01:08 PM	#7
psyki E36fiend 285 Rep 637 Posts Drives: 2014 435i xDrive Join Date: May 2019 Location: Sammamish, WA iTrader: (1) Garage List 2014 435i xDrive [0.00] 2014 X5 [0.00]	Are you able to check the codes with ISTA?
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12-10-2019, 07:13 AM	#8
Craig380 New Member 15 Rep 13 Posts Drives: 225xe, 420i GC Join Date: Sep 2019 Location: Macclesfield iTrader: (0)	A quick follow-up to conclude this thread. 5 days after it popped up, the CEL disappeared and did not reappear. Still no fault codes stored. The car has just had its first service, and during the inspection they found an emissions irregularity. Oxygen sensors were good, but an endoscope inspection in the exhaust showed the catalytic converter matrix had partially broken up internally. There was no external damage or impact to the cat can. Being replaced under warranty.
	Appreciate 0 Quote

12-11-2019, 10:23 PM	#9
SteveInfante NewFinishColumbia/detailer 604 Rep 2,096 Posts Drives: 2015 F31 xDrive Join Date: Sep 2010 Location: Columbia, SC iTrader: (0)	Mine just did this the other day once I hit 66,666 miles. Checked all the same things. Disappeared now so I guess I will schedule an apt for tomorrow to have them check it out. I was thinking something emissions. __________________ 328 F31 xDrive/OSM/Venetian Luxury Line/Cold Weather/Premium/Driving Assist/Nav/Tech "Golden Goose" 78' Honda CB400A project http://www.instagram.com/steve_inf31
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