P2179 - OBD II Trouble Code

Our automotive experts have put together the following information about the P2179 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2179 code.

OBD II Fault Code

• OBD II P2179

OBD-II Code Decreased engine performance is defined as a System Too Lean Off Idle

The engine control module (PCM) uses multiple sensors to determine the required amount of fuel needed to keep the engine running efficiently. If the PCM cannot achieve the desired balance between fuel and air, it will set code P2179.

Decreased engine performance Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P2179 Code

• Damaged or contaminated spark plug
• Engine sensor failure
• Exhaust leak
• Fuel injector failure
• Fuel pump failure
• Powertrain Control Module (PCM) software needs to be updated
• The fuel does not meet the manufacturer's requirements
• Vacuum leak

Common Repairs Needed for the P2179 Code

• Spark Plug Replacement
• Mass Airflow Sensor Replacement
• Fuel Pump Replacement