T8 / P0178 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)

P0178 00

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

On-board diagnosis

Type of diagnosis:

Continually

Enable criteria:

Engine Run

Fault criteria:

No signal from the sensor.

System reaction to a fault:

The control module uses "Estimated ethanol content" as a substitute value.

Checking the wiring harness

Jiggle the wiring harness at several points to detect intermittent breaks or short circuits. Check also the connector for oxidation or loose pins.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:

•	Measured Ethanol Content

•	Calculated Ethanol Content

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