The P2191 OBD-II code indicates that the engine control module (PCM) has detected that the air-fuel mixture in the engine is too lean during higher load conditions. This means that there’s not enough fuel being supplied to the engine for the amount of air entering it, leading to potential performance issues.
What Does the P2191 Code Mean?
The P2191 code is triggered when the PCM identifies that the engine is running leaner than the desired air-fuel mixture ratio. This issue can occur under heavy load situations, such as during acceleration or when climbing hills.
What Causes the P2191 Code?
Several factors can contribute to the P2191 code, including:
- Clogged air filter
- Damaged or contaminated spark plug
- Engine sensor failure
- Exhaust leak
- Fuel injector failure
- Powertrain Control Module (PCM) software needs to be updated
- The fuel does not meet the manufacturer’s specifications
What Are the Symptoms of the P2191 Code?
Drivers may notice the following symptoms when the P2191 code is present:
- Decreased engine performance
- Increased fuel consumption
How Serious Is the P2191 Code?
The P2191 code is considered urgent and requires immediate attention. If left unaddressed, it can lead to severe damage to the engine or other related components, as well as compromise the safety of the driver and passengers.
How to Diagnose the P2191 Code
To diagnose the P2191 code, a mechanic typically follows these steps:
- Use an OBD-II scanner to confirm the presence of the P2191 code.
- Inspect the air intake system for leaks or blockages.
- Check the condition of the spark plugs and replace them if necessary.
- Examine the fuel injectors for proper operation.
- Test the exhaust system for leaks.
- Evaluate the PCM for possible software updates.
Common Repairs for the P2191 Code
Repairs for the P2191 code may include:
- Spark plug replacement
- Mass airflow sensor replacement
- Fuel pump replacement
- Repairing or replacing the air filter
- Addressing any exhaust leaks
How Much Does It Cost to Fix the P2191 Code?
The cost to fix the P2191 code can vary widely based on the underlying cause, the make and model of the vehicle, and labor rates in your area. Generally, repairs may range from $100 to $1,000 or more, especially if major components need replacement.
Can I Fix the P2191 Code Myself?
While some DIY enthusiasts may be able to address minor issues, such as replacing spark plugs or an air filter, most repairs associated with the P2191 code require a good understanding of automotive systems. If you’re not experienced, it’s recommended to consult a professional mechanic to ensure accurate diagnosis and repair.
