08-04-2022, 03:13 PM | #1 |
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12B304 Code - Which O2 sensor to replace?
Hey guys! I have a 2015 BMW 435i M-Sport F36. The car has a VRSF catless downpipe, CTSturbo charge pipe, and BM3 stage 1 OTS tune.
I am inquiring about a trouble code as well as CEL that popped up recently, "12B304 - Lambda probe heating after catalyst activation: Line Break" Is there a specific O2 sensor I need to replace? Any insight is appreciated! The car has been running all existing modifications for 6 months with no issues until this past week. Last edited by n55steven; 08-04-2022 at 03:15 PM.. Reason: FYI |
08-04-2022, 03:54 PM | #2 |
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Drives: 2014 335i M-Sport Estoril Blue
Join Date: Feb 2017
Location: Sterling, VA
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"After catalyst" means literally the post-cat o2. Just make sure the connector didn't come loose for some reason before you replace it. Realoem says part number 11787645875.
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