What causes a car to have a p0171 lean code?

Chevy or any GM vehicles:Air or vacuum leak or Mass Air Flow. Sometimes a leaky fuel pressure regulator will cause this P0171 lean code too (depending on the fuel system of course). Dodge Jeep and Chrysler:Air or vacuum leak or Oxygen Sensor.

What does lean Bank 1 on a Chevy mean?

P0171 CHEVROLET Fuel Trim System Lean Bank 1: Code Meaning, Causes, Symptoms, & Tech Notes P0171 CHEVROLET | Fuel Trim System Lean Bank 1 | The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and

How does the p0171 Chevrolet fuel trim system work?

Excessive Fuel Consumption P0171 Chevrolet Description The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop.

What does the odb2 code p0171 mean?

P0171 is a very common code for any ODB2 vehicle. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1) . I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles.

What does p0171 system too lean Bank 1 mean?

P0171 System Too Lean Bank 1 Technical Description. System Too Lean (Bank 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.

What does the p0171 code on a Chevrolet mean?

P0171 CHEVROLET Tech Notes If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

What does the DTC code p0174 stand for?

Diagnostic trouble code (DTC) P0174 stands for “System Too Lean (Bank 2).” The code indicates that your car’s computer has detected a lean running condition. A lean condition is brought about by an imbalance in the air-fuel ratio due to either insufficient fuel or excessive air entering the engine.

What causes a car to have a p0171 lean code?