Question about 1999 Ford Windstar

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Too lean right and left banks code

How do I fix this problem?

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  • lisabueno Nov 18, 2008

    Thanks for the info. We have changed out the O2 sensors, replaced the hoses to the intake manifold, replaced the fuel filter, and the intake manifold gasket and plenum. We have tested the gas cap and tuned up the car, spark plugs, wires, and an oil change. I still get the check engine light and it does not reset after disconnecting the battery.



    I wish someone could help me with the correct diagnosis for this vehicle. My main question is does the computer need to be cleared of the error code too lean left and right banks or is there a reset button or process that we have not tried?



    Please if anyone can answer this question it would help me out so much.

    I really didn't want to have to bring the car into the dealership unless I have to.



    Thanks!



    Lisa

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  • Ford Master
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This condition is most likely caused by a vacuum leak at the intake manifold. One other possiable cause is the TSB from Ford that cites defective O2 sensors on the Windstar, you will have to check with Ford on that.

Posted on Nov 14, 2008

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I have a 2004 crossfire got a check engine lite hook up computer got code 171 and 174 check code mass air sensor left bank lean replace sensor erase code couple days same code again


if the fault code is back the fault is not fixed , Check other reasons left bank is running lean. also check oxygen censer is not faulty.

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P0171, P0174


I believe these at left and right bank lean codes, for both bank to go lean check under hood for vacuum leak, in or around the intake, with engine running at idle you should be able to hear hissing of vacuum leak, fix leaking vacuum, clear codes.

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2000 dodge dakota 4.7L left bank running lean


Check and replace the O2 sensor for that bank.
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P0171 and P0174 Left and Right bank lean trouble codes pulled from ECU. Check Engine Light illuminated.


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P0174 = system too lean bank 2

The fuel/air mixture is too lean for the entire engine. The fuel pump pressure could be too low. The fuel pump pressure regulator could be at fault. There could be an air leak downstream of the MAF sensor. MAF sensor (hot wire type) could be dirty. Check for intake manifold vacuum leaks. The engine coolant temp sensor and/or the intake air temp sensor could be faulty (stuck at full hot mode).

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Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

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