How do I fix code po171?

What repairs can fix the P0171 code?

  1. Replacing the fuel pump.
  2. Replacing the fuel filter.
  3. Replacing the fuel pressure regulator.
  4. Replacing the powertrain control module.
  5. Replacing one or more injectors.
  6. Replacing one or more oxygen sensors.
  7. Replacing the mass air flow sensor.
  8. Repairing a vacuum leak.

What repairs can fix the P0171 code?

Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass airflow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.

What causes code po171 and po174?

Code P0171 indicates Bank 1 of the engine has a lean fuel mixture. P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust.

Can a MAF sensor cause P0171?

An “under reporting” Mass Air Flow Sensor can be a common cause of a code P0171. Essentially, this means that the Air Flow Sensor is telling the computer that much less air is entering the engine than actually is.

How much does it cost to fix code P0171?

Perhaps your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code is appearing because it is due to you needing to replace your fuel injector/injectors. Generally, a fuel injector replacement cost will between $800 and $1,450 for a full replacement.

Can a bad gas cap cause a P0171 code?

It doesn’t set a code that is false.

How do I fix error P0171 too lean?

Can a dirty air filter cause a lean code?

If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition.

Can a bad 02 sensor cause a lean code?

If an (O2) sensor gets “lazy” because of old age or contamination; the computer may not be able to adjust the fuel mixture quickly enough, as the engine’s operating conditions change. (O2) sensors that are failing tend to read lean; which causes the fuel system to run overly rich to compensate.

How does the p0171 code work on a car?

The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine’s cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1.

When does the front O2 sensor Register p0171?

P0171 is triggered when the front O2 sensors recognize a lean mixture. It can both be a short-term lean mixture or a long-term lean mixture. If it’s a short-term lean mixture the fuel mixture is often very lean. If it’s a long-term mixture, it can register the code because of a small notice of lean mixture over time.

What causes a p0171 fuel trim system Lean Bank 1?

If the problem persists the front oxygen (O2) sensor may need to be replaced. The P0171 code could also be caused may be caused by one or more of the following: debris on the MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure, or Engine Control Temperature (ECT) Sensor reading inaccurate.

How much does it cost to diagnose p0171 Chevrolet fuel injection system?

The cost of diagnosing the P0171 CHEVROLET code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour. When is the code detected? – Fuel injection system does not operate properly.