06 Mustang GT P1071 & P1074

s197bag

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Hi there. I have a 2006 Mustang GT that I've had for some time and decided it was ready for some modifications.

I've added a SR Performance Cold Air Intake and drove for months and no issues.
I decided to throw on some shorty headers, Flowtech, to be exact and have had nothing but issues!

After I installed them, the P1071 code came stating my Bank 1 was too lean.
which is honestly expected since there is an exhaust leak due to a missing bolt (one snapped during uninstallation of original headers)

but after a week of driving the car, the P1074 code came on stating my Bank 2 is too lean.
I don't see why it was such a delay from the first code coming on, to the second one if it actually has had a problem. I've checked vaccum lines, checked if intake was good.

I was wondering if someone could help me out here. I'm frusturated because I don't know what's causing this, and feels like a mistake installing the headers since now I have a low fuel economy due to both banks adding +25% fuel.
 

s197bag

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also might be worth mentioning that I am not experiencing any symptoms that the engine is lean. (loss of power, rough idle, smoke from exhaust etc)
At one point I did have a misfire but it was due to a spark plug.
 

86GT351

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Fix the obvious first. Broken bolt, etc. Go over all of the bolts and make sure they are secured and snug. Mod motor header bolts can be hard to properly torque.
 

Juice

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You still have exhaust leak on both banks. Cannot have any leaks, period. I know first hand.
2nd fixing the obvious.
 

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