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Bosch·Oven / Rangehigh severity
Bosch Oven / Range Error Code E4
Shorted oven sensor
Common Causes
- 1Sensor wire short circuit
- 2Damaged insulation
- 3Sensor element failure
A shorted sensor makes the board read extreme low temperature, causing it to apply maximum heat. Disconnect power before diagnosis to prevent overheating.
Step-by-Step Troubleshooting
- 1
Disconnect power at the breaker and access the sensor wiring at the rear of the cavity
- 2
Measure sensor resistance — a short reads near 0 ohms instead of the healthy ~1080 ohms
- 3
Inspect the sensor wire where it passes through the oven cavity wall for insulation melted against the metal
- 4
Check the sensor connector for moisture and corrosion forming a bridge that shorts the two pins
- 5
Unplug the sensor and measure it alone — if the probe reads ~1080 ohms by itself, the short is in the harness, not the sensor
Pro Diagnostic Tip
E4 is the shorted-sensor mirror image of E3 (open sensor): a reading of 0-50 ohms is a short (E4), while infinite is an open (E3). The danger of a short is that the board reads it as freezing-cold and slams on full heat, so this is the more urgent of the pair. Critically, if the probe tests correctly at ~1080 ohms once disconnected, the short lives in the wiring harness rubbing through inside the hot cavity, not in the sensor — replace the harness, not the probe.
You Might Also Notice
- •Oven overheats rapidly past the setpoint
- •Display shows a very high temperature at startup
- •Oven will not calibrate or hold temperature
- •Element glows red and stays on
- •Fault appears the instant the oven is switched on
Parts, Cost & Difficulty
Repair Difficulty
Moderate — Some Experience NeededEstimated Repair Cost
$100–$250
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
Oven temperature sensor (NTC probe)Sensor wiring harness
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Error code E4 is a high-severity issue that can cause further damage to your oven / range if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does Bosch error code E4 mean?
Bosch error code E4 indicates: Shorted oven sensor. This is a high-severity issue affecting your oven / range.
How do I fix Bosch error code E4?
Disconnect power at the breaker and access the sensor wiring at the rear of the cavity Then, Measure sensor resistance — a short reads near 0 ohms instead of the healthy ~1080 ohms Then, Inspect the sensor wire where it passes through the oven cavity wall for insulation melted against the metal There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my oven / range has error E4?
Besides the error code on the display, common signs include: Oven overheats rapidly past the setpoint; Display shows a very high temperature at startup; Oven will not calibrate or hold temperature. If you notice any of these symptoms, check your oven / range's display panel for error code E4.
How much does it cost to fix Bosch E4?
Repair costs for Bosch E4 typically range from $100 to $250 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.
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