AutoCodes – Audi – P1509 Audi

P1509 Audi Code - Idle Air Control Circuit Electrical Malfunction

Quick Answer

P1509 Audi indicates Idle Air Control Circuit Electrical Malfunction. Common causes include Faulty Idle Air Control (IAC) valve, Idle Air Control (IAC) valve harness is open or shorted, Idle Air Control (IAC) valve circuit poor electrical connection. 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: P1509 Audi indicates Idle Air Control Circuit Electrical Malfunction.
Common causes: Common causes include Faulty Idle Air Control (IAC) valve, Idle Air Control (IAC) valve harness is open or shorted, Idle Air Control (IAC) valve circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,841

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1509 Audi Description

OBDII Code P1509 Audi - Idle Air Control Circuit Electrical Malfunction - AutoCodes.com — P1509 Audi Code - Idle Air Control Circuit Electrical Malfunction

What does this mean?

What are the Possible Causes of the DTC P1509 Audi?

Faulty Idle Air Control (IAC) valve
Idle Air Control (IAC) valve harness is open or shorted
Idle Air Control (IAC) valve circuit poor electrical connection

How to Fix the DTC P1509 Audi?

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 P1509 Audi 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 P1509 Audi code?

Need more information on how to fix the P1509 Audi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1509 Audi code diagnosed by a professional: Find a repair shop in your area

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.