09-22-2019, 06:27 AM | #1 |
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Lambda Probe Problem
I am new to this forum, but have enjoyed reading things especially as it pertains to my M4.
I have a custom tune on my M4 from a tuner using the BM3 software. I have catless downpipes, and continue to receive the CEL of "12B304 lambda probe heating after catalyst activation: line break". How can I determine which specific O2 sensor it actually is without having to purchase both of them? |
12-03-2019, 08:33 PM | #2 | |
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04-16-2020, 12:37 AM | #4 |
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I have the same issue and have bm3. I also got the other bank which was the other code listed. They are bank 1 and bank 2 post cat o2 sensors.
I’m trying to figure out if they both went bad at the same time maybe as they appear together. 12b304 And 12b404 |
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05-05-2020, 02:10 PM | #5 | |
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BMW Oxygen Sensor - Genuine BMW 11787848486 and BMW Oxygen Sensor - Genuine BMW 11787848487 Reflashed car with stg2 OTS BM3 and CEL went away. |
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05-23-2020, 05:23 AM | #7 |
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12B304 = Bank 1, cyl's 1-3, part 11787848486
12B404 = Bank 2, cyl's 4-6, part 11787848487 https://www.realoem.com/bmw/enUS/sho...88#11787848487 |
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