What Does P219A Mean?
The PCM has detected that cylinders on Bank 1 are not contributing equally to engine power output, indicating an air/fuel imbalance between cylinders. This is typically detected through crankshaft acceleration analysis during combustion events.
Common Causes
35%
Restricted or failing fuel injector(s) on Bank 1 causing uneven fuel delivery
25%
Intake manifold runner carbon buildup causing uneven air distribution
20%
Vacuum leak affecting specific cylinder(s) on Bank 1
15%
Unequal compression across Bank 1 cylinders (valves, rings)
5%
Variable valve timing system malfunction on Bank 1
Diagnostic Steps
1
Step 1: Perform cylinder contribution test or power balance test to identify which cylinder(s) are weak
2
Step 2: Check fuel injector flow rates and spray patterns for all Bank 1 injectors using flow bench or oscilloscope
3
Step 3: Perform compression test and cylinder leakdown test on Bank 1 cylinders to rule out mechanical issues
4
Step 4: Inspect intake manifold and valves for carbon buildup, especially on direct injection engines
5
Step 5: Monitor individual cylinder fuel trim data if available to pinpoint affected cylinder(s)
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected that cylinders on Bank 1 are not contributing equally to engine power output, indicating an air/fuel imbalance between cylinders. This is typically detected through crankshaft acceleration analysis during combustion events.
The most common cause of P219A (Bank 1 Air/Fuel Ratio Imbalance) is: Restricted or failing fuel injector(s) on Bank 1 causing uneven fuel delivery
Typical repair costs for P219A range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience rough idle and reduced performance. Can lead to catalyst damage if one cylinder runs significantly lean or rich.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P219A to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Engine Mechanical
Difficulty
Type
Generic (SAE)
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