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BMW 3-Series (E90 E92) Forum
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Random 2C9C & 2CA8 fault codes
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06-12-2022, 10:31 AM | #1 |
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Random 2C9C & 2CA8 fault codes
Hey guys, I have an e90 318i (N46 engine) which I recently did a compression test on.
When removing the sparkplugs, I noticed a lot of oil on the sparkplug threads of #2 and #3. This makes me believe that I have a VCG leak so I will most definitely address this. However, after cleaning & putting everything back together and going for a spin, I get the check engine light with 2C9C & 2CA8 as stored fault codes. INPA 2C9C: DME: Oxygen-sensor heater before cat. 1 2CA8: DME: Oxygen-sensor heater behind cat. 1 OBD Equivalent P0037: HO2S Heater Control Circuit Low Bank 1 Sensor 2 P0030: HO2S Heater Control Circuit Bank 1 Sensor 1 These fault codes were not existing before I did the compression test. I checked the fuses and everything seems fine. I'm thinking that maybe some oil leaked down in to the cylinders when I removed the oily spark plugs and maybe that caused the O2 sensors to trip, however I'm not quite sure.. Any thoughts on this? |
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