Want a regional phone & address? Pick your area.
Bosch·Oven / Rangehigh severity
Bosch 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 and access sensor wiring
- 2
Measure sensor resistance — a short reads near 0 ohms instead of ~1080 ohms
- 3
Inspect sensor wire routing through oven cavity wall for insulation damage from heat
- 4
Check for moisture intrusion at sensor connector causing corrosion bridge
Pro Diagnostic Tip
E4 (short) vs E3 (open) — if resistance is 0-50 ohms, it is a short (E4). If the sensor connector itself is clean and the sensor tests correctly when disconnected, the short is in the wiring harness between sensor and board, not the sensor itself.
You Might Also Notice
- •Oven overheats rapidly
- •Display shows very high temperature at startup
- •Oven will not calibrate
Parts, Cost & Difficulty
Repair Difficulty
Moderate — Some Experience NeededEstimated Repair Cost
$100–$250
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
12-009-872-001 (oven temperature sensor/NTC probe)12-009-872-005 (sensor wiring harness, if damaged)
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Safety First — Know the Risks
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.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Get Professional Help Now
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.
Licensed & Insured · 90-Day Warranty · Same-Day Appointments Available
4.85 (232 verified reviews)
Same-Day Appliance Repair
Fixed or It's Free
$89 → $0 Service Call & Diagnosis — offer ends May 31
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 and access sensor wiring Then, Measure sensor resistance — a short reads near 0 ohms instead of ~1080 ohms Then, Inspect sensor wire routing through oven cavity wall for insulation damage from heat There are 1 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; Display shows very high temperature at startup; Oven will not calibrate. 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.