P0159

Tests 1 - 5:

Test 6:

SYMPTOM
P0159-O2 SENSOR 2/2 SLOW RESPONSE

TEST NOTE
This symptom is diagnosed using the test P0133-O2 SENSOR 1/1 SLOW RESPONSE.

WHEN MONITORED
Start and drive vehicle greater than 20 MPH and less than 55 MPH. Throttle open for a minimum 120 seconds. Coolant Temp greater than 70 °C (158 °F) Catalytic Converter Temperature greater than 600°C.

SET CONDITION
The O2 sensor voltage switches properly from lean to rich during monitoring. Two Trip Fault.

POSSIBLE CAUSES
- Intermittent condition
- Exhaust leak
- O2 sensor signal circuit
- O2 sensor return circuit
- O2 sensor