Knock Sensor 3 Circuit Bank 1
This code means the PCM/ECM has detected a fault affecting knock sensor 3 circuit bank 1. Because combustion on the affected cylinder or circuit is disrupted, drivers may notice rough running, misfires, hard starts, or reduced power.
What You Might Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Hard starting
- Reduced power
- Poor fuel economy
Most Common Causes
- 1
Failed ignition coil, glow plug, or related component
- 2
Damaged wiring or poor connector contact
- 3
Worn spark plug or combustion problem
- 4
Low system voltage or ground issue
- 5
PCM/ECM driver fault
How to Diagnose It
- 1
Check Failed ignition coil, glow plug, or related component — Inspect for signs of failure and test before replacing.
- 2
Check Damaged wiring or poor connector contact — Inspect for signs of failure and test before replacing.
- 3
Check Worn spark plug or combustion problem — Inspect for signs of failure and test before replacing.
- 4
Check Low system voltage or ground issue — Inspect for signs of failure and test before replacing.
- 5
Check PCM/ECM driver fault — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Test the affected coil, glow plug, or ignition-related component
- 2
Inspect spark plugs and basic engine condition
- 3
Repair damaged wiring, grounds, or connector pins
- 4
Replace the failed ignition-related part
- 5
Clear the code and confirm the symptom is gone
Need a deeper diagnosis?
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