I am getting a check engine code P0171 and P0455. What could this be?
P0171 VOLKSWAGEN - System Too Lean engine cylinder Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
P0455 VOLKSWAGEN - EVAP System (fuel vapor storage and control) Large Leak Detected
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
SOURCE: Check engine light is on, error code is P0171.
Check the MAFS (sensor connected to air intake) and check the hoses under your hood to see if any are broken as this will be the cheapest to fix..
If all the hoses are good, then you should have your O2 Sensor checked as that is the most likely culprit
SOURCE: What is the trouble code p1684, and p0455.
1684 is 'battery disconnected in last 50 starts' and should shut off after you have used it for 50 more.
0455 is 'Evaporative emission control system leak detected (gross leak)
SOURCE: Showing check engine - then the code reader is p1133 and p0171
miles...?
P1135 Air-Fuel Sensor Heater Circuit Response.
the air fuel sensor malfunction is the main problem and thats causing the code p0171.
Hard to start o long cranking time to starter is gona be the first symtoms.
replace upstream. (the air fuel Sensor and the oxygen sensor is the same)
SOURCE: My check engine light is on and I am getting codes
The p0455 is for a leak concern and if that was the only code I'd say give the cap a shot. However the p0455 is most likely just a side effect of the P0449. The P0449 is a test that is run on the vent solenoid circuit to check the electrical functions in basic terms. The computer is putting out voltage amount X and in a properly functioning circuit it knows it will see voltage amount Y come back. It isn't coming back as what it expects to come back at so there must be something electrically wrong with the vent circuit. And of course if the vent doesn't work you get a large leak. If we are just throwing parts at trucks the logical one for you is a vent valve. Since your Vue is a 2008, most likely there is a good chance that it's covered under the emission warranty which is 5 years.
Thank you for using fixya. and be safe.
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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