P0133

Tests 185 - 190:

Test 191:

SYMPTOM
P0133 - 1/1 O2 SENSOR SLOW RESPONSE

WHEN MONITORED
With ECT greater than 147 °F, after reaching a vehicle speed of 10 mph, and the throttle remaining open (OFF idle) for 2 minutes, bring the vehicle to a stop and allow the engine to idle with the transmission in DRIVE.

SET CONDITION
The oxygen sensor signal voltage is switching from below 0.35 volts to above 0.53 volts and back fewer times than required.

POSSIBLE CAUSES
- Exhaust leak
- O2S sensor ground circuit voltage drop
- O2S signal circuit voltage drop
- Wiring harness intermittent defect
- O2S defective