Cylinder #3 Imbalance Error
P219E indicates that the engine control module (ECM) has detected a significant air-fuel ratio imbalance specifically in cylinder #3. This means cylinder #3 is running either too rich or too lean compared to the other cylinders, often due to fuel delivery issues, vacuum leaks, or ignition problems. The ECM monitors oxygen sensor readings and fuel trim adjustments to identify the imbalance.
1. Most Common Causes
- Faulty fuel injector on cylinder #3
- Vacuum leak near cylinder #3 intake runner
- Weak or faulty spark plug or ignition coil on cylinder #3
- Low compression in cylinder #3
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Decreased fuel economy
- Hesitation or stumbling during acceleration
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm cylinder #3 imbalance.
Step 2: Inspect spark plug and ignition coil on cylinder #3; swap with another cylinder to see if misfire follows.
Step 3: Perform a fuel injector balance test or swap injectors to isolate a faulty injector.
Step 4: Check for vacuum leaks using a smoke machine or propane enrichment test near cylinder #3 intake.
Step 5: Perform a compression test on cylinder #3 to rule out mechanical issues.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the imbalance can cause catalytic converter damage and poor engine performance. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Costs vary from $50 for a spark plug replacement to $150 for a fuel injector replacement, plus diagnostic fees.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.