It looks like the fuel mixture is too thin. A good mechanic will be able to give you a better idea as to what's causing it.
Codes are....
P0457 = Evaporative Emission System Leak Detected (fuel cap loose/off).
P0174 = System too lean, bank 2.
P0171 = System too lean, bank 1.
P1151 = Lack Of HO2S21 Switch - Sensor Indicates Lean.
P0171 - System to Lean (Bank 1)
P0174 - System to Lean (Bank 2) Lack of fuel or too much air - unmetered air after the mass air flow sensor ! vacuumn leak . Not enough fuel - low fuel pressure , clogged injectors .
P0171 - System to Lean (Bank 1)
The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information.
Air Measurement System
Fuel System
Air Induction System
Exhaust System
EGR System
Secondary Air Injection
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.
P0457 - EVAP Control System Leak Detected (Fuel Filler Cap Loose/Off)
A fuel tank pressure change less than a minus (-) 7 inches of H 2 0 in 30 seconds has occurred after refueling; or there is excessive purge (fuel vapor) flow greater than 0.06 pounds per minute.
Check for missing fuel filler cap or integrity of the cap. If OK, clear continuous memory DTCs and re-initiate EVAP Emission Running Loss Monitor Drive Cycle.
Stuck open evap purge valve , maybe. Take your vehicle to a qualified repair shop an have the evap system smoke tested .
P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when fuel control system no longer detects switching for a calibrated amount of time.
See Possible Causes for DTC P1130
SOURCE: my check engine light came on 2004 ford taurus had
P174 means Oxygen sensor was slow in switching Single, Right
or Rear HO2S - Fuel control
P171 means Oxygen sensor not switching - system was at adaptive
limits - Single, Right or Rear HO2S - Fuel control
Visit http://www.troublecodes.net/Ford/
for a comprehensive code listing for your car.
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SOURCE: I have a 98 ford windstar with check engine light
These are all related:
P1537 and P1538 are BOTH:
Intake Manifold Runner Control Stuck Open
P0171 is Lean Bank #1
P0174 is Lean Bank #2.
On the front of the Intake Manifold there are Plastic Clips. The Clips are currently broken and need to be replaced. Because these are broke the Computer is registering too much Air or not enough Fuel = Lean.
You should be able to purchase these at any auto parts store (call ahead for availablility).
After you replace these, all the Codes should disappear.
Let me know if this helped, or if you have addtional information or questions. Feel free to contact me at FixYa.com!
SOURCE: cODE PO457
this is an evap code. and most of the time it's a faulty gas cap or the gas cap is not tight enough try putting some vasoline on the gas caps rubber seal and tighten it at least 3 clicks. if the light does not go out. take it to a repair shop that can do a smoke test to find the evap leak
SOURCE: My 2000 Ford Ranger keeps showing codes PO 171 and
These codes mean that the oxygen sensor is reading too "Lean" on both the left and right cylinder banks and the engine control system can't compensate any further to solve the problem. You may have a dirty or failing Mass Airflow Sensor that is miscalcuating the amount of airflow the engine is taking in which in turn can cause both of these codes to set. If the sensor is reporting less air than the engine is actually taking in then the engine computer will add only the amount of fuel it should based on what it was told by the sensor which will cause both cylinder banks to run "lean". There could be something else going on such as having two bad oxygen sensors [very rare] but I do see these two codes together quite often and usually its the sensor that is causing it. Hope this helps a bit!
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