Applicable Systems
OBD-II

Symptoms

Cylinder 5 misfiring; applies to 5+ cylinder engines; rough idle and power loss.

Possible Causes

  • Worn spark plug
  • Failed ignition coil
  • Clogged fuel injector
  • Mechanical (valve/rings)

Troubleshooting Steps

  1. Step 1: Swap test spark plug
    Misfire follows if bad
  2. Step 2: Swap test coil
    Misfire follows if bad
  3. Step 3: Compression test cyl 5
    Within spec
  4. Step 4: Injector diagnosis
    Injector OK
  5. Step 5: Replace faulty component
    No misfire on cyl 5

How to Reset

Clear with OBD-II scanner.

Common Replacement Parts

  • Spark Plug
  • Ignition Coil

Frequently Asked Questions

  • Q: Which cylinder is #5?

    Cylinder numbering varies by engine. Common: front-to-back on each bank. Check service manual for your engine's firing order and numbering.

Related OBD-II Generic (SAE J2012) Fault Codes

Source: SAE J2012 standard DTC list + OBD-II portal

Category: OBD-II