DTC B1521 KIA
O2 (B2 S1) Heater Circuit
O2 (B2 S1) Heater Circuit
Description
Key off after a warm engine drive cycle, engine cool-down finished (at least 5 seconds after the key is turned off), system voltage over 10.5v, then with the ASD relay energized, the PCM detected the O2 signal rose to 0.49v or more within a 144 second per
Cause and Solution
ASD relay power supply circuit to the heater is openO2 heater ground circuit open or O2 signal circuit is openO2 heater element has high resistanceO2 heater element has failed (open or shorted)PCM has failed
Video Guide
Diagnostic Info
- DTC Code: B1521
- Brand: KIA