Cylinder #2 Imbalance Error
P219D indicates that the engine control module (ECM) has detected a significant air-fuel ratio imbalance in cylinder #2 compared to the other cylinders. This is often caused by a vacuum leak, fuel injector issue, or ignition problem affecting only that cylinder. The imbalance can lead to rough idling, reduced fuel economy, and potential catalytic converter damage if left unaddressed.
01. Most Common Causes
- Vacuum leak on cylinder #2 intake runner
- Clogged or leaking fuel injector on cylinder #2
- Weak or faulty spark plug or ignition coil on cylinder #2
- Low compression in cylinder #2 due to worn rings or valves
02. Symptoms You Will Notice
- Rough idle or misfire felt at idle
- Check Engine Light illuminated
- Decreased fuel economy
- Hesitation or stumbling during acceleration
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P219D and check for related codes.
Step 2: Inspect vacuum hoses and intake manifold gasket near cylinder #2 for leaks using a smoke machine or propane enrichment.
Step 3: Swap spark plug and ignition coil from cylinder #2 to another cylinder and see if the misfire or imbalance follows.
Step 4: Perform a fuel injector balance test or swap injectors to isolate a faulty injector on cylinder #2.
Step 5: Check compression on cylinder #2; if low, perform a leak-down test to identify valve or ring issues.
04. Commonly Affected Makes
05. 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 drivability. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost varies from $50 for a simple vacuum leak repair to $150 or more for injector or ignition component replacement, plus diagnostic fees.