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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > 12B304 Code - Which O2 sensor to replace?
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      08-04-2022, 03:13 PM   #1
n55steven
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Unhappy 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
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      08-04-2022, 03:54 PM   #2
Eschmacher
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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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