P0030

P0030 00

O2S 1 Preheater Circuit Performance Problem







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.
NONE of the following DTCs must be detected: P0685, P0686, P0687

Fault criteria:
When current is below 300 mA for more than 10 s.

Dependent:
P0628
P0629

System reaction to a fault:
Closed loop is blocked.
Preheating of oxygen sensors 1 and 2 is stopped.
Fuel adaption is blocked.
Adaption of rear oxygen sensor is blocked and reset.


OK report:
When fault criteria NOT fulfilled for 11 s.

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

Diagnosis regards:
Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:
Test value:
- O2S 1 Preheating

Activation:
- O2S 1 Preheating
- Fuel Pump