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Don't have any experience with it, but its usually always safer to unplug the battery when working on the electrical systems. If you plan on getting the tune soon, you could just run with the CEL on for the time being, it wouldn't cause any issues, it may only just mask any real CELs.
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2008 Jerez Black Metallic E93 6MT
K&N Drop In Filter | HPA Pulley | Custom Catless Resonated X-Pipe | BPM Stage II Tune | Megan Racing Exhaust
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