P0354

High Severity

Ignition Coil D Primary/Secondary Circuit

Ignition System

What Does P0354 Mean?

Coil on cylinder 4 fault.

Common Fix

Replace ignition coil

Estimated Cost (DIY)

$20 - $80

Symptoms

  • ⚠️Cylinder 4 misfire
  • ⚠️Rough idle

Related Symptoms

Common Causes

Failed coillikely
Wiringpossible

How to Diagnose P0354

  1. 1Swap coil
  2. 2Check wiring
  3. 3Replace

OEM Diagnostic Flowchart

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Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0354.

Frequently Asked Questions

What causes coils to fail early?
Running with worn spark plugs, heat soak from exhaust, and oil leaks onto coil boots.
Can oil on a coil cause misfires?
Yes — oil from a leaking valve cover gasket can deteriorate the coil boot insulation.

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