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How do I fix the code P0171 on my Ford?

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How do I fix the code P0171 on my Ford?

  1. STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.
  2. STEP 2: INSPECT VACUUM LINES.
  3. STEP 3: INSPECT MASS AIR FLOW (MAF) SENSOR.
  4. STEP 4: INSPECT EXHAUST SYSTEM.
  5. STEP 5: CHECK FUEL PRESSURE.
  6. STEP 6: REPLACE AIR-FUEL AND/OR O2 SENSORS.
  7. STEP 7: INSPECT AND REPLACE SPARK PLUGS.

What causes the P0171 code?

A P0171 code indicates the air-fuel ratio entering your engine block is not ideal. Two main issues typically cause this code. There is either too much air or not enough fuel in the lines to create the right ratio. When there’s too much air, you’ll often find a vacuum leak allowing an excess of oxygen into the line.

Can a clogged fuel filter cause a P0171 code?

Here are some of the possible causes of a P0171 code: Vacuum leak due to damaged intake manifold gaskets or punctured vacuum and positive crankcase ventilation (PCV) hoses. Malfunctioning mass airflow (MAF) sensor. Clogged fuel filter.

How much does it cost to fix a system too lean Bank 1?

You may need to replace the fuel pump if it is weak or faulty. These problems cause the air-fuel mixture to be off and trigger the System too lean bank 1 code since the pump can’t get enough fuel to the engine. On average, this repair costs $870, where parts cost around $690 and labor costs around $180.

Can an exhaust leak cause a P0171 code?

An exhaust leak upstream of the O2 is kind of unlikely to cause a p0171, as it would have to be siphoning ‘clean’ air in via venturi effect. A head gasket leak or cracked head will allow the coolant to be burned.

Can a PCV valve cause P0171?

The most common causes of the P0171 code are vacuum or intake leaks, low fuel pressure, faulty PCV valve, or a faulty MAF sensor. Other things can also cause the P0171 code.

Can a bad O2 sensor cause a P0171?

You probably know that the answer the questions is — no! A P0171 or P0174 lean code with an O2 sensor reading lean all the time mean — well, several things. The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean.