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Old 07-12-2021, 01:33 PM
Join Date: Sep 2005
Location: New England
Posts: 133
btrvalik is on a distinguished road
Missing gas cap now bank 2 misfires

My daughter told be the SES came on so I scanned the codes and found an evaporator leak fault P0442. When I check for the gas cap it was gone so I assumed the mystery was solved. Once I replace the gas cap and fired it up, the engine ran really rough - when I scanned again I got bank 2 lean codes and misfires. Note that the evaporator error has cleared itself since the screen shot. Seems a little too coincidental that these faults are not related to the missing gas cap, but it still does not name sense to me. Any ideas?
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Old 07-12-2021, 02:03 PM
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 1,197
80stech is on a distinguished road
I would start by clearing everything and maybe even resetting adaptations and then see what comes up again.
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
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Old 07-12-2021, 03:08 PM
Join Date: Jun 2021
Location: Austin, TX
Posts: 155
X5chemist is on a distinguished road
As these codes popped up when the gas cap went missing, where was fuel added? Hope E85 was not used. I would add premium, clear the codes and run it.
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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Old 07-12-2021, 03:27 PM
Join Date: Sep 2005
Location: New England
Posts: 133
btrvalik is on a distinguished road
the only code I had at first was the evaporator code. They the car sat for a couple of days while I got an OEM cap. I installed the cap, fired it up and it immediately ran terrible. Clearing codes does not help - the evap code is gone but all others remain
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Old 07-13-2021, 02:50 AM
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Join Date: Jun 2015
Location: Racine, WI
Posts: 7,859
andrewwynn will become famous soon enough
All those codes suggests either voltage problem or fuel supply problem.

Confirm alternator output 13.5 ± 0.3 including while driving with load eg high beams on and coasting to a stop (when revs drop from 2000> 600 is when voltage tends to drop)

Confirm fuel pressure starts at 50psi when key is turned on and that It will maintain pressure overnight (should read 20-30psi after 8 hours).
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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Old 07-13-2021, 01:04 PM
Join Date: Jun 2013
Location: Virigina, USA
Posts: 2,410
StephenVA is on a distinguished road

2005 X5 4.8IS
The Blue ones are always FASTER....

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