Help to diagnose codes

[zerolash]

Need help on how to diagnose these codes.
Maf sensor replaced with oem
Speed sensor also replaced oem
2015 GT 29k miles
Car seems to run ok.
Not running in limp mode.
Fresh 93 octane 5 gallons( but 2 year old gas about 3 gallons was in car before refill)
Smoke test performed no leaks
New plugs

Sponsored

 

[Noyz5o]

Have you run any E85?

 

[zerolash]

No but maybe previous owner? If they did it would be old.

 

[Noyz5o]

I've had a lot of 02 sensors go bad because of running E85. They just don't like that fuel. Do you have headers and are you tuned?

 

[zerolash]

Headers and a Lund tune. 30% lean because of a code

 

[Noyz5o]

I'd put a set of O2 sensors in it and see what happens. You are likely tuned with a Flex Fuel tune so you will need to drive the vehicle and allow it to learn the Alcohol percentage. Monitor the ALH_LRN and ALH%.

 

[Noyz5o]

Also perform a Misfire re-learn using the N-Gauge. Clear all codes

Sponsored