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
- Step 1: Swap test spark plug
Misfire follows if bad - Step 2: Swap test coil
Misfire follows if bad - Step 3: Compression test cyl 5
Within spec - Step 4: Injector diagnosis
Injector OK - 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.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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