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Message: <blockquote data-quote="vermilion" data-source="post: 615086" data-attributes="member: 9891">egr issues would throw a p0174 code on lean conditions on both banks. along with associated egr valve code and insufficient airflow. also, a leaking throttle body and elbow would also trip a p0174 without egr codes. vacuum lines or weaker injectors will throw a lean code among other miscellaneous codes. you can use carb and choke cleaner for any vacuum issues. i ggogled this p1151 code to come to:Short to VPWR in the harness or HO2S Water in the harness connector Open/shorted HO2S circuit Corrosion or poor mating terminals and wiring Damaged HO2S Damaged PCM Fuel System:Excessive fuel pressureLeaking/contaminated fuel injectorsLeaking fuel pressure regulatorLow fuel pressure or running out of fuelVapor recovery system Induction System:Air leaks after the MAF Vacuum Leaks PCV system:Improperly seated engine oil dipstick EGR System:Leaking gasket Stuck EGR valve Leaking diaphragm or EVR Base Engine:Oil overfill Cam Timing Cylinder compression Exhaust leaks before or near the HO2S(s)</blockquote>