BMW Error Code P1347: How to Fix It

Medium 2-4 hours High Severity Verified June 2026
Error Code
P1347
Brand
BMW
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
2-4 hours
BMW error code P1347 indicates a misfire in cylinder 6 that's severe enough to potentially damage the catalytic converter. This is a high-severity issue that requires immediate attention to prevent costly engine and emissions system damage.
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Tools You'll Need

How to Fix Error Code P1347

  1. Turn off engine immediately

    Do not continue driving - severe misfires can cause catalytic converter failure
  2. Scan for additional codes

    Turn off engine and allow it to cool before working under the hood
  3. Inspect cylinder 6 ignition coil

  4. Check spark plug condition

    Allow engine to cool completely before removing spark plugs to avoid burns
  5. Test ignition coil resistance

  6. Perform compression test

    Remove all spark plugs and disable fuel injection before compression testing
  7. Check fuel injector operation

  8. Replace faulty components

    Use proper torque specifications when installing spark plugs to avoid thread damage
  9. Clear codes and test drive

    Drive gently during initial testing - stop immediately if misfire returns

Parts You May Need

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When to Call a Professional

Call a professional mechanic if compression testing reveals internal engine problems, if multiple cylinders are misfiring, if you're uncomfortable working with ignition systems, or if the problem persists after replacing basic ignition components. Engine internal damage requires specialized tools and expertise.

Frequently Asked Questions

Can I drive with BMW error code P1347?
No, you should not drive with P1347. This code indicates a severe misfire that can damage your catalytic converter, which is extremely expensive to replace. Stop driving immediately when this code appears.
What causes BMW P1347 cylinder 6 misfire?
Common causes include faulty ignition coils, worn spark plugs, clogged fuel injectors, low compression due to worn engine components, vacuum leaks, or wiring issues in the ignition system.
How much does it cost to fix BMW P1347?
Repair costs vary widely depending on the cause. Simple fixes like spark plugs or ignition coils cost $100-400. More serious issues like fuel injectors or internal engine problems can cost $500-3000 or more.
Will P1347 damage my BMW catalytic converter?
Yes, P1347 specifically indicates a misfire severe enough to damage the catalytic converter. Unburned fuel from the misfire can overheat and destroy the catalyst, leading to expensive repairs.
How do I know if my BMW ignition coil is bad?
Signs include rough idle, loss of power, poor fuel economy, and fault codes. You can test coils with a multimeter or swap coils between cylinders to see if the misfire moves to a different cylinder.