Trouble Code: P0171
Fuel System Too Lean (Cylinder Bank 1)
Possible Causes:
Air leaks after the MAF sensor, or leaks in the PCV system
Exhaust leaks before or near where the HO2S is mounted
Fuel injector(s) restricted or not supplying enough fuel.
Fuel pump not supplying enough fuel during high fuel demand conditions.
Leaking EGR gasket, or leaking EGR valve diaphragm.
MAF sensor dirty (causes ECM to underestimate airflow).
Vehicle running out of fuel or engine oil dip stick not seated .
Trouble Code: P0455
EVAP Control System Large Leak Detected
Possible Causes:
Aftermarket EVAP hardware non-conforming to specifications
EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube disconnected or cracked, or canister is damaged
EVAP canister purge valve stuck closed, or canister damaged.
Fuel filler cap missing, loose (not tightened) or the wrong part.
Loose fuel vapor hose/tube connections to EVAP components .
Canister vent (CV) solenoid stuck open.
Fuel tank pressure (FTP) sensor has failed mechanically .Here are the solutions.
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