P0159

Test 1 - 3:

Test 4 - 5:

SYMPTOM
P0159-O2 SENSOR 2/1 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
- Good trip equal to zero
- Exhaust leak
- O2 signal circuit
- O2 return circuit
- O2 sensor