Chrysler PT Cruiser 2001 Service Manual Supplement page 2541

Symptom:
P0139-1/2 O2 SENSOR SLOW RESPONSE
When Monitored and Set Condition:
P0139-1/2 O2 SENSOR SLOW RESPONSE
When Monitored: Continuous for approximately the first 7 minutes operation. After
warm-up, 60 - 96 KMH (20 - 60 MPH), 1150 - 2500 RPM and 8.2 - 15.7 MAP.
Set Condition: The oxygen sensor signal voltage is switching from below 0.35 volts to
above 0.53 volts and back fewer times than required.
INTERMITTENT CONDITION
EXHAUST LEAK
O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP
O2 SENSOR GROUND CIRCUIT VOLTAGE DROP
O2 HEATER ELEMENT
O2 SENSOR HEATER GROUND CIRCUIT OPEN
ASD RELAY OUTPUT CIRCUIT OPEN
O2 SENSOR
TEST
1 NOTE: Record the Freeze Frame Information that was set along with the
DTC.
NOTE: Check for contaminates that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
Turn the ignition on.
With the DRBIII , read DTC's.
Is the Good Trip display and equal to zero?
Yes → Go To 2
→ Go To 9
No
2 Start the engine.
Inspect the exhaust for leak between the engine and the O2 sensor.
Inspect the exhaust for leaks between the engine and the appropriate rear O2 Sensor.
Are there any exhaust leaks?
Yes → Repair or replace the leaking exhaust parts as necessary.
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
81
APPLICABILITY
All
All