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T8 / P0030 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE

  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 section 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

(See also description of readings/activations in diagnostic tool)