AutoCodes – Generic – P219C

P219C Code - No. 1 Cylinder Air-Fuel Ratio Variation

Quick Answer

The Powertrain Control Module (PCM) detects the imbalance amount from the sizes of the 0.5-order and 1.0-order components compared to 0.8-order excitation input by the fuel injection to determine the air/fuel ratio variation between the cylinders. Common causes include Faulty fuel injector, Fuel rail clogged, Intake manifold air leak/clogged. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P219C indicates No. 1 Cylinder Air-Fuel Ratio Variation.
Common causes: Common causes include Faulty fuel injector, Fuel rail clogged, Intake manifold air leak/clogged.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,114

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 18, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P219C Description

The Powertrain Control Module (PCM) detects the imbalance amount from the sizes of the 0.5-order and 1.0-order components compared to 0.8-order excitation input by the fuel injection to determine the air/fuel ratio variation between the cylinders. The obtained components are used to learn the fuel coefficient of each cylinder and performs the imbalance reduction control. If it is not possible to suppress the variation even if the imbalance reduction control is performed; resulting the imbalance amount is large and the fuel coefficient is a specified value or more, the PCM detects as imbalance failure and the Diagnostic Trouble Code (DTC) will set.

OBDII Code P219C - No. 1 Cylinder Air-Fuel Ratio Variation - AutoCodes.com — P219C Code - No. 1 Cylinder Air-Fuel Ratio Variation

What does this mean?

What are the Possible Causes of the DTC P219C?

Faulty fuel injector
Fuel rail clogged
Intake manifold air leak/clogged
Cam lift failure
Ignition system failure
Engine compression abnormal
Valve clearance incorrect

How to Fix the DTC P219C?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P219C code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P219C code?

Need more information on how to fix the P219C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P219C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P219C Acura — No. 1 Cylinder Air-Fuel Ratio Variation
P219C Honda — No. 1 Cylinder Air-Fuel Ratio Variation
P219C Lexus — Cylinder 1 Air-Fuel Ratio Imbalance
P219C Scion — Cylinder 1 Air-Fuel Ratio Imbalance
P219C Toyota — Cylinder 1 Air-Fuel Ratio Imbalance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P219C Code

1. What are the common symptoms of OBDII code P219C (No. 1 Cylinder Air-Fuel Ratio Variation)?

- Common symptoms include rough idle, reduced engine performance, misfires, and potentially an illuminated check engine light.

2. What are the possible causes of OBDII code P219C?

- Causes can include a faulty oxygen sensor, vacuum leaks, intake manifold leaks, fuel injector issues, or problems with the mass airflow sensor.

3. How can I diagnose the source of OBDII code P219C?

- Diagnosing the issue may involve conducting a thorough inspection of the oxygen sensor, checking for vacuum leaks, inspecting the intake manifold, testing fuel injectors, and examining the mass airflow sensor.

4. Can a dirty or clogged fuel injector trigger OBDII code P219C?

- Yes, a dirty or clogged fuel injector can disrupt the air-fuel ratio in the No. 1 cylinder, potentially triggering code P219C.

5. Is it safe to continue driving with OBDII code P219C present?

- It is not recommended to drive with this code present as it can lead to engine performance issues and potentially cause further damage if left unresolved.

6. How can I repair OBDII code P219C?

- Repair steps may involve replacing the oxygen sensor, fixing any vacuum or intake leaks, cleaning or replacing fuel injectors, and addressing any issues with the mass airflow sensor.

7. Can a malfunctioning mass airflow sensor cause OBDII code P219C?

- Yes, a malfunctioning mass airflow sensor can disrupt the air-fuel mixture in the No. 1 cylinder, leading to the triggering of code P219C.

8. Are there any DIY fixes for OBDII code P219C?

- While some simple checks like inspecting for visible vacuum leaks can be done by DIY enthusiasts, diagnosing and repairing the underlying causes of P219C may require professional assistance.

9. Will resetting the check engine light resolve OBDII code P219C?

- Resetting the check engine light may temporarily turn it off, but the underlying issue causing code P219C will remain unresolved and is likely to trigger the light again.

10. How can a professional mechanic help with OBDII code P219C?

- A professional mechanic can conduct a comprehensive diagnosis using specialized tools, accurately pinpoint the root cause of the issue, and perform the necessary repairs to resolve OBDII code P219C effectively.