What Does P219C Mean?
Cylinder #1 is contributing disproportionately to engine power compared to other cylinders, indicating an air/fuel mixture imbalance specific to this cylinder. The PCM detects this through crankshaft speed variations during individual cylinder combustion events.
Common Causes
40%
Cylinder #1 fuel injector restricted, leaking, or failing
25%
Cylinder #1 intake valve carbon buildup restricting airflow
20%
Compression loss in Cylinder #1 due to valve, ring, or gasket issues
10%
Vacuum leak specific to Cylinder #1 intake runner
5%
Cylinder #1 ignition component causing incomplete combustion
Diagnostic Steps
1
Step 1: Swap Cylinder #1 fuel injector with another cylinder and retest to see if problem moves
2
Step 2: Perform compression test and leakdown test specifically on Cylinder #1
3
Step 3: Inspect Cylinder #1 spark plug for fouling, wear, or abnormal deposits
4
Step 4: Use borescope to visually inspect Cylinder #1 intake valve and piston top for carbon buildup
5
Step 5: Test Cylinder #1 injector flow rate and compare to specifications and other cylinders
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
Cylinder #1 is contributing disproportionately to engine power compared to other cylinders, indicating an air/fuel mixture imbalance specific to this cylinder. The PCM detects this through crankshaft speed variations during individual cylinder combustion events.
The most common cause of P219C (Cylinder #1 Imbalance Error) is: Cylinder #1 fuel injector restricted, leaking, or failing
Typical repair costs for P219C range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may cause rough idle and vibration. Prolonged operation can damage catalytic converter and reduce engine longevity.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P219C to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Engine Mechanical
Difficulty
Type
Generic (SAE)
Recommended Tools
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