P0153

Tests 1 - 4:

Tests 5 - 6:

SYMPTOM
P0153-2/1 O2 SENSOR SLOW RESPONSE

TEST NOTE
This symptom is diagnosed using the test 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 0.27 volts to above 0.62 volts and back fewer times than required.

POSSIBLE CAUSES
- Intermittent condition
- Exhaust leak
- O2 sensor signal circuit voltage drop
- O2 sensor ground circuit voltage drop
- O2 sensor