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Old Mar 19, 2026 | 09:15 AM
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Default Engine codes
After about 2 weeks getting my cat back exhaust installed and a couple of drives back and forth to work, I have a check engine light with 3 codes.

P2255 - 02 sensor negative current control circuit low bank 2 sensor 1
C1555 - Manufacturer control
C1518 - Manufacturer control

You think a wire got melted of maybe came loose? Any thoughts? Dealer said it wasn't anything they did but my gut tells me a melted wire
or harness is laying against the new exhaust somewhere?

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Old Mar 19, 2026 | 09:32 AM
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Provide the exhaust information and you could try asking the makers of the exhaust for their opinion .
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Old Mar 19, 2026 | 09:36 AM
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Contacted them also but I have been told P2255 Sensor 1 error is before the cats and they were never touched?
Exhaust Manufacturer is Yonristic out of California
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Old Mar 19, 2026 | 09:41 AM
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Autozone etc might be able to re-set the code and see from there [free] ......then its back to the dealer under warranty hopefully .
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Old Mar 19, 2026 | 09:44 AM
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I can re-set with the reader I have but it comes back after about a 5 minute drive? I am wondering if there is a harness that didn't get tucked out of the way and got melted?
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Old Mar 19, 2026 | 09:59 AM
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dealer ...unless you wanna pull the engine cover off or remove the trunk to check
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Old Mar 19, 2026 | 06:44 PM
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Anybody know a scanner model that can relearn the exhaust AFM and NPP valves?
Dealer and Exhaust manufacturer both say that is what I need. Local Autozone and Oreillys don't have any that will do that.
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Old Mar 19, 2026 | 11:38 PM
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Originally Posted by EVL-C8
Anybody know a scanner model that can relearn the exhaust AFM and NPP valves?
Dealer and Exhaust manufacturer both say that is what I need. Local Autozone and Oreillys don't have any that will do that.
Launch creader elite is what most people use. I keep mine in the car to check codes etc.
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