featured Diesel Heater E04 Fault Code: Flame Sensor Short Circuit — Diagnosis and Fix
E04 (blink code 00100) means a short circuit on the flame sensor — resistance below 500 ohms. The disconnect-and-rescan test tells you whether to replace the sensor or the ECU.
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Diesel Heater E00 Fault Code: Flame Sensor Open Circuit — Diagnosis and Fix
E00 (blink code 00000) means the flame sensor circuit is open — its resistance reads too high. Check the sensor resistance first; replace the flame sensor, and the ECU only if the fault persists.
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