CEL after 3" cat back install

[SilverStallion]

I've had JLT intake, Ford racing injectors and a catch can for a little bit now. No CEL on what so ever with my tune. About a month ago put in a xforce xat bad and 2 weeks in CEL for bank 1/2 to rich. .989-.992 lambda mixture . Didn't think adding a cat back would require a tune since its after a sensor not before. No exhaust leaks, air filter is clean. Need some help figuring this out

Thanks in advance

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[jrsimon27]

I've had JLT intake, Ford racing injectors and a catch can for a little bit now. No CEL on what so ever with my tune. About a month ago put in a xforce xat bad and 2 weeks in CEL for bank 1/2 to rich. .989-.992 lambda mixture . Didn't think adding a cat back would require a tune since its after a sensor not before. No exhaust leaks, air filter is clean. Need some help figuring this out

Thanks in advance

Catbacks wont give you a cel

 

[SilverStallion]

Catbacks wont give you a cel

My thoughts exactly . The only think that has changed since I've been getting the CEL is the cat back. I've also tried flashing it back to stock the. Reloading the tune . Was good for a weeks

 

[jrsimon27]

My thoughts exactly . The only think that has changed since I've been getting the CEL is the cat back. I've also tried flashing it back to stock the. Reloading the tune . Was good for a weeks

Make some logs and send them to your tuner maybe he helps

 

[Zelek]

Could be the change in size. I've seen tuners ask about 3" systems in regards to emissions tunes. While it shouldn't cause an issue, something changed with the exhaust flow.

 

[Bluelightning]

Or you've got an o2 sensor going bad....

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