Chrysler PT Cruiser 2001 Service Manual Supplement page 2537

Symptom List:
P0134-1/1 O2 SENSOR STAYS AT CENTER
P0140-1/2 O2 SENSOR STAYS AT CENTER
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0134-1/1 O2 SENSOR STAYS AT
CENTER.
When Monitored and Set Condition:
P0134-1/1 O2 SENSOR STAYS AT CENTER
When Monitored: With the engine running for more than 2 minutes and engine
temperature greater than 76°C (170°F).
Set Condition: The unpstream oxygen sensor signal voltage is between 0.35 volts and
0.55 volts for 1 minute.
P0140-1/2 O2 SENSOR STAYS AT CENTER
When Monitored: With the engine running for more than 2 minutes and engine
temperature greater than 76°C (170°F).
Set Condition: The unpstream oxygen sensor signal voltage is between 0.35 volts and
0.55 volts for 1 minute.
O2S SENSOR GROUND CIRCUIT OPEN
O2S SIGNAL CIRCUIT OPEN
WIRING HARNESS INTERMITTENT PROBLEM
O2 SENSOR SIGNAL CIRCUIT CHECK WITH DRBIII
PCM
TEST
1 Turn the ignition on.
With the DRB, read the DTC's.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
No
POSSIBLE CAUSES
ACTION
→ Go To 6
DRIVEABILITY - GAS
77
APPLICABILITY
All