Engine codes

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Mar 19, 2026 | 09:15 AM

EVL-C8

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Pro

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From: Central MO

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?

Mar 19, 2026 | 09:32 AM

patton

Melting Slicks

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From: panama city beach florida USA

St. Jude Donor '09

Provide the exhaust information and you could try asking the makers of the exhaust for their opinion .

Mar 19, 2026 | 09:36 AM

EVL-C8

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From: Central MO

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

Mar 19, 2026 | 09:41 AM

patton

Melting Slicks

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From: panama city beach florida USA

St. Jude Donor '09

Autozone etc might be able to re-set the code and see from there [free] ......then its back to the dealer under warranty hopefully .

Mar 19, 2026 | 09:44 AM

EVL-C8

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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?

Mar 19, 2026 | 09:59 AM

patton

Melting Slicks

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From: panama city beach florida USA

St. Jude Donor '09

dealer ...unless you wanna pull the engine cover off or remove the trunk to check

Mar 19, 2026 | 06:44 PM

EVL-C8

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From: Central MO

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.