P3016

12BD22 - P3016

Information saved in
DME

Fault code
12BD22 - P3016

Fault text
Oxygen-sensor heater before catalytic converter, function:
internal resistance of signal circuit too highly resistant

Fault description
The diagnostic function monitors the calibrated resistance of
the heater for the oxygen sensor before the catalytic
converter in the DME.

Condition for fault identification
Test condition:
The fault is recognized when the calibrated resistance of the
heater for the oxygen sensor before the catalytic converter in
the DME control module is outside the tolerance range.
Potential problem source(s):
- DME defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Engine warmed to normal temp, above 80 °C
Time condition:
- None
Other conditions:
- Engine ON

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- Replace DME if fault frequency is greater than 3

Fault effect and breakdown warning
Breakdown notice:
Continued driving is possible, but because the oxygen
sensor is not ready for closed-loop control, conversion of
exhaust gases in the catalytic converter will be seriously
impaired.
Possible apparent symptoms:
- MIL lamp lights up after 2nd driving cycle
- Higher exhaust emissions
- Higher fuel consumption
- Surge

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
None