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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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Old 01-26-2015, 07:25 PM
bimmerlover707 bimmerlover707 is offline
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Location: Eureka ca
Join Date: Jan 2015
Posts: 2
Mein Auto: 645ci
increased emissions code

I've got an issue that is scaring me in my 2005 645ci 175k miles! It has no mufflers. Was straight piped past the catalytic converters "Ca." I am throwing p0491 codes and other random misfires. I brought it in and the shop diagnosed it as a bad battery.. ? Made sense to me sorta.. they charged me over $300.. light came back on. I pulled a spark plug on cyl 1 and it had lots of white build-up. I'd like to not keep throwing money at this. Also I lose a bit of coolant somewhere. Haven't seen any drip, but the shop also sailed there was coolant residue in places. Would the thermostat and a tune-up possibly help?
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