The dreaded “check engine” light illuminates your Audi S5’s dash, and a scan reveals the ominous trouble code 16347 intermittent. Don’t panic! This guide provides valuable insights into understanding, diagnosing, and resolving this common issue, empowering you to take control and get your S5 back on the road.

Decoding the Mystery: What is Audi S5 Trouble Code 16347 Intermittent?

Trouble code 16347 often points to an issue within the secondary air injection system. This system pumps fresh air into the exhaust manifold during cold starts, promoting faster catalytic converter warm-up and reducing emissions. The “intermittent” tag suggests the problem isn’t constant, making it more challenging to pinpoint. This can manifest in various ways, from a rough idle to a noticeable decrease in fuel efficiency.

Why Does My Audi S5 Have This Issue?

Several factors can contribute to trouble code 16347 intermittent. Common culprits include faulty secondary air injection pump relays, malfunctioning check valves, clogged or damaged air hoses, and even issues with the pump itself. Identifying the root cause is crucial for effective repair.

Common Causes of Audi S5 Trouble Code 16347 Intermittent

• Faulty Relays: The relays controlling the secondary air injection pump can wear out or become corroded, disrupting the electrical signal.
• Check Valve Issues: A stuck or leaking check valve can prevent proper airflow and trigger the code.
• Clogged Hoses: Over time, air hoses can become clogged with debris, restricting airflow and causing pressure buildup.
• Failing Pump: The secondary air injection pump itself can fail due to wear and tear or internal damage.

Diagnosing the Problem: A Step-by-Step Approach

1. Visual Inspection: Start with a visual inspection of the secondary air injection system components. Look for any obvious signs of damage, loose connections, or clogged hoses.
2. Check the Relays: Locate the secondary air injection pump relays and test them using a multimeter. A faulty relay won’t provide the correct voltage.
3. Inspect the Check Valves: Examine the check valves for proper operation. A faulty valve might be stuck open or closed, disrupting airflow.
4. Test the Air Hoses: Check the air hoses for clogs or damage. Use a pressure gauge to ensure proper airflow.
5. Diagnose the Pump: Test the secondary air injection pump using a scan tool to check for proper operation and airflow.

What Does Intermittent Mean in a Trouble Code?

“Intermittent” signifies that the issue doesn’t occur consistently. This can make diagnosis tricky, requiring patience and a systematic approach.

Fixing the Issue: Getting Your S5 Back in Shape

Once you’ve identified the root cause, you can take appropriate action. This might involve replacing a faulty relay, cleaning or replacing clogged hoses, or even replacing the secondary air injection pump itself.

Replacing the Secondary Air Injection Pump

Replacing the pump can be a more involved process, but it’s often a necessary fix. This usually requires accessing the pump from underneath the vehicle and carefully disconnecting the electrical and air connections.

Conclusion: Conquering the 16347 Intermittent Code

Audi S5 trouble code 16347 intermittent can be a frustrating issue, but with the right knowledge and approach, it’s manageable. By following the steps outlined in this guide, you can effectively diagnose and resolve the problem, restoring your S5’s performance and peace of mind. Need expert assistance? Contact us at +1 (641) 206-8880 and our email address: vcdstool@gmail.com or visit our office at 6719 W 70th Ave, Arvada, CO 80003, USA. VCDSTool is ready to help.

FAQ

1. Is it safe to drive with trouble code 16347 intermittent? While you might not experience immediate drivability issues, it’s best to address the problem promptly to prevent further complications.

2. Can I fix this issue myself? With basic mechanical skills and the right tools, you can tackle some of the repairs, like replacing relays or cleaning hoses. However, more complex repairs might require professional assistance.

3. How much does it cost to fix trouble code 16347 intermittent? The cost varies depending on the specific problem and labor rates.

4. What other codes are related to the secondary air injection system? Other codes related to this system might include P0491 or P0492.

5. How often should I check my secondary air injection system? Regular visual inspections and diagnostic checks during routine maintenance can help prevent issues.

6. Can I prevent this code from occurring in the future? Regular maintenance and addressing any underlying issues promptly can help prevent future occurrences.

7. What happens if I ignore the trouble code? Ignoring the code can lead to further damage, potentially affecting the catalytic converter and emissions system.