AutoCodes – Audi – P0308 Audi

P0308 Audi Code - Cylinder 8 Misfire Condition

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8. 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: P0308 Audi indicates Cylinder 8 Misfire Condition.
Common causes: Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8.
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 13,727

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0308 Audi Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

OBDII Code P0308 Audi - Cylinder 8 Misfire Condition - AutoCodes.com — P0308 Audi Code - Cylinder 8 Misfire Condition

What does this mean?

What are the Possible Causes of the DTC P0308 Audi?

Faulty spark plug 8
Clogged or faulty fuel injector 8
Faulty ignition coil 8
Fuel injector 8 harness is open or shorted
Fuel injector 8 circuit poor electrical connection
Ignition coil 8 harness is open or shorted
Ignition coil 8 circuit poor electrical connection
Insufficient cylinder 8 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0308 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

The P0308 code means that the cylinder 8 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 8. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0308 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 P0308 Audi Code

1. What are the common symptoms of an OBDII code P0308 (Cylinder 8 Misfire) in an Audi?

- Common symptoms include engine misfiring, rough idle, loss of power, and potential engine vibrations.

2. What are the possible causes of a Cylinder 8 misfire in an Audi triggering the OBDII code P0308?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the source of a Cylinder 8 misfire in my Audi when the OBDII code P0308 is triggered?

- You can start by checking the spark plugs, ignition coils, and fuel injectors for any signs of wear or damage. Performing a compression test and inspecting for vacuum leaks can also help pinpoint the issue.

4. Will driving with an OBDII code P0308 (Cylinder 8 Misfire) in my Audi cause further damage to the engine?

- Continuing to drive with a misfire can potentially damage the catalytic converter and other engine components over time. It is advisable to address the issue promptly.

5. How can I repair a Cylinder 8 misfire in my Audi related to the OBDII code P0308?

- Repair options include replacing faulty spark plugs, ignition coils, or fuel injectors. Addressing any vacuum leaks, performing a compression test, and resetting the engine control module may also be necessary.

6. Can a dirty or clogged fuel injector cause a Cylinder 8 misfire in an Audi leading to the OBDII code P0308?

- Yes, a dirty or clogged fuel injector can disrupt the proper fuel delivery to the cylinder, resulting in a misfire and triggering the OBDII code P0308.

7. Is it recommended to clear the OBDII code P0308 (Cylinder 8 Misfire) in an Audi after repairing the issue?

- Yes, after addressing the underlying cause of the misfire, it is advisable to clear the trouble code using an OBDII scanner to reset the Check Engine Light.

8. Can extreme weather conditions affect the occurrence of a Cylinder 8 misfire in an Audi causing the OBDII code P0308?

- Extreme temperatures can impact engine performance and potentially exacerbate existing issues leading to a misfire, so it's important to ensure your Audi is properly maintained in all conditions.

9. How often should I replace spark plugs and ignition coils in my Audi to prevent a Cylinder 8 misfire and OBDII code P0308?

- It is recommended to follow the manufacturer's guidelines for spark plug and ignition coil replacement intervals to maintain optimal engine performance and reduce the risk of misfires.

10. What steps can I take to prevent a Cylinder 8 misfire in my Audi and avoid triggering the OBDII code P0308 in the future?

- Regular maintenance, including timely spark plug and ignition coil replacements, using high-quality fuel, and addressing any engine issues promptly, can help prevent misfires and OBDII trouble codes like P0308.