Check Engine Preheat Circuit

A problem has been detected in the preheat circuit (glow plugs), making cold starting difficult.

Possible causes

Defective glow plug
Failed preheat relay
Blown preheat fuse
Loose or corroded wiring

Recommended actions

Verify glow plug continuity
Check voltage at preheat relay
Inspect fuses in the control box
Clean electrical terminal connections

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