HO2S TRANSITION TIME RATIO SENSOR 1
PCM reads Heated Oxygen Sensor (HO2S) activity for 100
seconds. During this period, PCM counts the number of Lean/Rich (L/R)
and Rich/Lean (R/L) switches.
With this information, an average time for all transitions
can be determined. PCM then divides R/L average by L/R rich average to
obtain a ratio. If HO2S ratio is not within range, DTC P1134 will set.
You likely won't notice any drivability problems.
- Engine operating in closed loop mode.
- Check exhaust system for leaks. Repair as necessary.
- Visually inspect HO2S 1 for secure installation or
corrosion on terminals.
- Replace HO2S