DTC B1521 Mitshubishi
Rear HO2S Circuit problem
Rear HO2S Circuit problem
Description
The PCM monitors inversion cycle period, Rear HO2S output voltage inclination. The PCM detects that the voltage inclinations are below threshold consecutive 5 times when following conditions are met, or isn’t below 0.3 V for 2 seconds after fuel cut, the
Cause and Solution
Rear HO2S malfunctionRear HO2S contaminated due to wrong fuel, or it has deterioratedPCM has failed
Video Guide
Diagnostic Info
- DTC Code: B1521
- Brand: Mitshubishi