Did some thread searching and possibly have already found an answer to my question but just wanted to ask it directly and hopefully get a straight answer....

Check engine light is on with a P0171 code which is fuel system too lean. In addition, I am more than positive I have ANOTHER exhaust manifold crack/leak. Is that more than likely the cause of the check engine light/code?

2007 JKU Sahara

 

Here is the list of possible causes for P0171. Exhaust leak falls under Engine Mechanical, but it is very early in the troubleshooting procedure.

[TABLE]
[TR]
[TD="bgcolor: white, align: center"]Possible Causes
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]RESTRICTED FUEL SUPPLY LINE
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]FUEL PUMP INLET STRAINER PLUGGED
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]FUEL PUMP MODULE
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 SIGNAL CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 RETURN CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]MAP SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]ECT SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]ENGINE MECHANICAL
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]FUEL FILTER/PRESSURE REGULATOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]POWERTRAIN CONTROL MODULE (PCM)[/TD]
[/TR]
[/TABLE]