Late Production (NGC)

Test 1:

Test 2 - 5:

Test 6:

SYMPTOM
P0135-O2 SENSOR 1/1 HEATER PERFORMANCE

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

SET CONDITION
O2 Heater Temperature does not reach 575° C (959° F) within 45 second during monitoring conditions. Two Trip Fault.

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