What are the common causes of P219C?

A dirty or faulty fuel injector on cylinder 1. A weak spark plug or ignition coil on cylinder 1. An intake manifold leak near cylinder 1. Low fuel pressure affecting cylinder 1. Low compression on cylinder 1.

Read the cylinder 1 fuel trim on a scan tool. Swap the cylinder 1 injector and see if the fault follows. Check the cylinder 1 spark plug and ignition coil. Check for an intake leak near cylinder 1. Run a compression test on cylinder 1. Clear the code and retest.

P219C

Cylinder 1 Air-Fuel Ratio Imbalance

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P219C means Cylinder 1 Air-Fuel Ratio Imbalance.

Check these first

A dirty or faulty fuel injector on cylinder 1
A weak spark plug or ignition coil on cylinder 1
An intake manifold leak near cylinder 1
Low fuel pressure affecting cylinder 1
Low compression on cylinder 1

What to do next

Read the cylinder 1 fuel trim on a scan tool
Swap the cylinder 1 injector and see if the fault follows
Check the cylinder 1 spark plug and ignition coil
Check for an intake leak near cylinder 1
Run a compression test on cylinder 1
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.