B1413
Book Code B1413 Inspection
Automotive Climate Control
High Impact Failure
Code B1413 - Evaporator Temperature Sensor Circuit (Toyota / Lexus)
Monitors the surface temperature of the indoor evaporator core to prevent moisture freezing into ice. A fault disrupts compressor regulation.
Safe to Drive? ✅ Yes, Safe
Estimated Repair Cost 250 - 750 SAR
Common Makes Toyota, Lexus
System Category sensor
Symptoms of Trouble Code B1413:
- ⚠️ Airflow slowly chokes and stops blowing after 15-20 min due to ice block on evaporator
- ⚠️ Compressor fails to cycle on if sensor reads open circuit
- ⚠️ Massive water pool under vehicle after shutdown as ice melts
Common Causes Behind Code B1413:
- 🔍 Failed thermistor element inside HVAC plenum box
- 🔍 Mold or severe dirt buildup coating the thermistor tip
- 🔍 Open or shorted harness between sensor and AC amplifier
Diagnostic Procedure Recommended by Auto Save Technicians:
- 1 Check live data on diagnostic scanner (should hover around 1°C to 4°C during active cooling)
- 2 If fixed at -40°C or +80°C, the thermistor circuit is open or shorted
Specialist Recommendation:
Request Parts & Repair Quote
If AC freezes on highway, turn off AC switch and run blower on MAX to thaw ice.
Associated Components: Evaporator Temperature Thermistor HVAC Case Assembly
Frequently Asked Questions: Code B1413
Does replacing evaporator sensor require removing the entire dashboard?
On some cars it is accessible under the glove compartment; others require partial lower dash removal.