P1133

Description
HO2S INSUFFICIENT SWITCHING SENSOR 1

PCM monitors Heated Oxygen Sensor (HO2S) activity for 100
seconds. PCM determines if HO2S 1 is functioning properly by counting
number of HO2S 1 Lean/Rich (L/R) and Rich/Lean (R/L) switches. If PCM
determines that HO2S 1 did not switch enough times, DTC 1133 is set.

Symptoms
You likely won't notice any drivability problems.

Causes

• Engine operating in closed loop mode.

Solutions

• Check exhaust system for leaks. Repair as necessary.
• Visually inspect HO2S 1 for secure installation or
  corrosion on terminals.
• Replace HO2S