AutoCodes – Audi – P0291 Audi

P0291 Audi Code - Cylinder 11 Injector Circuit Low

Quick Answer

Code P0291 is triggered when the Engine Control Module (ECM) detects a low voltage in the Fuel Injector 11 Circuit. Common causes include Dirty Fuel Injector 11, Faulty Fuel Injector 11, Plugged Fuel Injector 11. 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: P0291 Audi indicates Cylinder 11 Injector Circuit Low.
Common causes: Common causes include Dirty Fuel Injector 11, Faulty Fuel Injector 11, Plugged Fuel Injector 11.
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 4,061

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 Apr 15, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0291 Audi Description

Code P0291 is triggered when the Engine Control Module (ECM) detects a low voltage in the Fuel Injector 11 Circuit. During normal conditions, the ECM turns the Fuel Injectors ON and OFF in the Fuel Injection System.

OBDII Code P0291 Audi - Cylinder 11 Injector Circuit Low - AutoCodes.com — P0291 Audi Code - Cylinder 11 Injector Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0291 Audi?

Dirty Fuel Injector 11
Faulty Fuel Injector 11
Plugged Fuel Injector 11
Fuel Injector #11 harness is open or shorted
Fuel Injector #11 circuit poor electrical connection

How to Fix the DTC P0291 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 does this mean?

Code Tech Notes

Clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0291 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.

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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 P0291 Audi Code

1. What does the OBDII code P0291 mean on an Audi?

P0291 indicates a "Cylinder 11 Injector Circuit Low" fault, meaning the ECM has detected a low voltage or malfunction in the injector circuit for cylinder 11.

2. What are common symptoms of the P0291 code?

Symptoms may include rough idling, reduced engine performance, misfires, poor fuel economy, and the Check Engine Light being illuminated.

3. What causes the P0291 code on an Audi?

Possible causes include a faulty fuel injector, damaged injector wiring, poor electrical connections, a failed ECM, or a clogged injector.

4. Can I drive my Audi with the P0291 code?

Driving with this code is not recommended, as it can lead to engine misfires, reduced performance, and potential engine damage if left unresolved.

5. How do I diagnose the P0291 code?

Start by inspecting the wiring and connectors for cylinder 11's injector, checking for damage or corrosion. Use a multimeter to test for proper voltage and resistance in the circuit, and consider testing the injector itself.

6. How do I fix the P0291 code on an Audi?

Repairs may include replacing a faulty fuel injector, repairing damaged wiring or connectors, cleaning a clogged injector, or, in rare cases, replacing the ECM.

7. Can a dirty fuel injector cause the P0291 code?

Yes, a clogged or dirty fuel injector can restrict fuel flow and cause the circuit to operate improperly, triggering the P0291 code.

8. What tools are needed to fix the P0291 code?

Common tools include an OBDII scanner, a multimeter for electrical testing, and possibly fuel injector cleaning or replacement tools.

9. How much does it cost to repair the P0291 code?

The cost varies, ranging from $100-$300 for injector cleaning or wiring repairs, to $500 or more if the injector or ECM needs replacement.

10. Can a bad ECM cause the P0291 code?

While rare, a malfunctioning ECM can misinterpret or fail to control the injector circuit properly, leading to the P0291 code. This should be considered after ruling out other causes.