P0140

P0140 00

O2S Circuit. No Activity Detected. Sensor 2.







Fault symptom
Check Engine

On-board diagnosis

Type of diagnosis:
Continuous

Enable criteria:
Battery voltage must be between 11 - 16 V.
Engine running.
Preheating active for more than 4 s.
Lambda control active for more than 5 s.
Fuel shut-off for more than 7 s.

Fault criteria:
When voltage across sensor has not been below 400 mV after a 7 second fuel shut-off.

Dependent:
None

System reaction to a fault:
Preheating is switched off.
Adaption of rear oxygen sensor is blocked and reset.

OK report:
Diagnosis completed without fault report.

Fault handling:
Type III
(See Description of On-Board Diagnostics/Fault handling III, "Other emission-related components and functions" for more information.)

Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help
The voltage across a defective sensor is 0.40 V - 0.50 V. OK if it exceeds 0.55 V.