E101 on a Bosch oven points at the oven temperature sensor — the NTC probe that tells the control how hot the oven is. When it reads open, shorted, or out of range, the control can't trust the temperature, so it won't heat correctly and throws E101. It's one of the more repairable Bosch oven codes because the sensor is an affordable, common part. Here's the order a tech works it.
The main cause. The NTC sensor drifts out of spec, opens, or shorts, so the control reads an invalid temperature and flags E101.
Check it: With the oven cool and unplugged, a tech checks the sensor's resistance against spec and inspects it. Out-of-range = replace the sensor, an affordable common part.
A momentary glitch can trip a one-off E101.
Check it: Unplug the range (or flip its breaker) for 5 minutes and restore power. If E101 stays gone through a normal bake, it was a glitch. If it returns, move to the sensor.
A loose or corroded connector at the sensor, or a damaged wire, reads exactly like a failed sensor.
Check it: A tech reseats and inspects the sensor connector and harness during the sensor check — sometimes that alone clears E101.
Least common — the control misreads a good sensor circuit.
Check it: If the sensor and wiring test good but E101 stays, a tech tests the oven control board.
Repair — an oven temperature sensor is one of the more affordable oven parts, with flat labor well below a new oven. E101 is a very fixable code.
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First reset it — unplug the range (or flip the breaker) for 5 minutes. If E101 comes back, the fix is almost always the oven temperature sensor (NTC), which reads out of range; a tech checks the sensor and its connector and replaces the sensor, an affordable common part.
It's an oven temperature sensor (NTC) fault — the sensor reads open, shorted, or out of range, so the control can't trust the temperature and won't heat right. Usually the sensor itself; sometimes a loose connector.
Yes — the oven sensor is an affordable, common part. Your $50 Quick Check credits toward the repair, so you'll know the exact cost first.