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Well code 171 means the computer thinks the fuel mixture is too lean on bank one. Bank one is the side with cylinder one.
The problem could be low fuel pressure, or a faulty O2 sensor among other things.
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DTC code PO400 could be caused by a clogged EGR valve or EGR tube. try cleaning the EGR valve, tube
DTC code PO171 is fuel system too lean bank 1
DTC code PO174 is fuel system too lean Bank 2
Most likely suspects are O2 sensors, But can be caused by vacuum leaks and also can be Mass airflow sensor (MAF) try cleaning with electrical parts cleaner
DTC code PO 302 is a misfire at cylinder # 2
Check spark plugs and wires
Try cleaning the EGR Valve first along with changing the spark plug first, and see if any codes erase, in other words start with the cheaper fixes first, as some problems can be causing the other other codes
code p0171 refers to system too lean bank 1===causes ---intake /exhaust leak---AIR system--MAF/VAF sensor---fuel pressure /pump---injector/s ---HO2S sensor
if it runs ok then replace the HO2S sensor in bank 1 (exhaust before the cat converter at the firewall side of the engine)
your car is probably running rough
its sucking air from the intake mininfold
is your intake maninfold plastic? but your veicle is defenetly having a vaccum problem
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