P0155

Tests 1 - 5:

Tests 6 - 7:

SYMPTOM
P0155-O2 SENSOR 2/1 HEATER PERFORMANCE

TEST NOTE
This symptom is diagnosed using the test P0135-O2 SENSOR 1/1 HEATER PERFORMANCE.

WHEN MONITORED
Engine Running and Heater duty cycle greater than 0%.

SET CONDITION
02 Heater Temperature does not reach 575 °C (959 °F) within 45 second during monitoring conditions. Two Trip Fault.

POSSIBLE CAUSES
- O2 heater element
- O2 sensor heater ground circuit open
- O2 heater control circuit open
- Intermittent condition
- PCM